2025

• Hydrogen Supply Networks‘ Evolution for Air Transport – Final Project Report
  Schenke, Finn; Hoelzen, Julian; Hanke-Rauschenbach Richard; Schomburg, Leon; Schlemminger, Marlon; Mahner, Alexander; Bredemeier, Dennis; Niepelt, Raphael; Brendel, Rolf; Müller, Tobias; Gronau, Steven; Winter, Etti; Grote, Ulrike; Fiedler, Karen; Barke, Alexander; Manke, Lisa-Marie; Joormann, Imke; Spengler, Thomas Stefan; Marx, Rebecca; Stiller, Sebastian; Öğrük, Akın; Thies, Christian; Hoppe, Annika Carolina; Minke, Christine; Stops, Laura; Rehfeldt, Sebastian; Klein, Harald; Kade, Andreas; Schneider, Matthias
  HyNEAT Project, Hydrogen Supply Networks‘ Evolution for Air Transport – Final Project Report, 2025.
  Open Access | Publisher DOI
• Simulation-based analysis of country-specific mitigation strategies to decarbonize the passenger car fleet: A comparison between Germany, Poland, and Norway
  Ginster, Raphael; Kieckhäfer, Karsten; Thies, Christian; Runde, Christoph; Wansart, Jörg; Spengler, Thomas Stefan
  Journal of industrial ecology 29 (5): 1867-1881 (2025)
  Open Access | Publisher DOI
• Life cycle assessment of circular economy strategies for high-strength connection bolts in wind turbines
  Stützle, Joshua; Stammler, Matthias; Dege, Jan Hendrik; Thies, Christian
  32nd CIRP Conference on Life Cycle Engineering, LCE 2025
  Open Access | Publisher DOI
• A multi-perspective framework to address manufacturing and transportation challenges in green hydrogen supply chains
  Klumpp, Matthias; Meisel, Frank; Thies, Christian; Buscher, Udo
  Procedia Computer Science 253: 673-682 (2025)
  Open Access | Publisher DOI
• DEALA — A novel economic life cycle impact assessment method for differentiated economic assessments in the context of life cycle sustainability assessments
  Popien, Jan Linus; Barke, Alexander; Ginster, Raphael; Striecks, Theresa; Thies, Christian; Spengler, Thomas Stefan
  Journal of Industrial Ecology 29 (1): 19-33 (2025)
  Open Access | Publisher DOI
• Design of hydrogen supply networks for aviation: dynamic optimization model and transition pathways for German airports
  Öğrük, Akin; Schenke, Finn; Hanke-Rauschenbach Richard; Thies, Christian
  Technische Universität Hamburg (2025)
  Open Access
• Green Hydrogen Supply Chain Network Design for Aviation: Model Development and Case Study for German Airports in 2050
  Öğrük, Akın; Marx, Rebecca; Thies, Christian; Stiller, Sebastian
  Operations research proceedings 2023: 453-460 (2025)
  Open Access | Publisher DOI

2024

• Flexibility in manufacturing system design: A review of recent approaches from operations research
  Weckenborg, Christian; Schumacher, Patrick; Thies, Christian; Spengler, Thomas Stefan
  European Journal of Operational Research 315 (2): 413-441 (2024-06-01)
  Open Access | Publisher DOI
• Volkswagen Group Logistics applies operations research to optimize supplier development
  Wieczorrek, Sönke; Thies, Christian; Weckenborg, Christian; Grunewald, Martin; Spengler, Thomas Stefan
  INFORMS Journal on Applied Analytics 54 (2): 103-204 (2024)
  Publisher DOI

2023

• Pariskonforme Transformationspfade für die Automobilindustrie
  Kieckhäfer, Karsten; Wansart, Jörg; Thies, Christian; Ginster, Raphael
  ATZ - Automobiltechnische Zeitschrift 125 (10): 54-58 (2023)
  Publisher DOI
• Green hydrogen supply chain network design for aviation: model development and case study for German airports in 2050
  Öğrük, Akın; Marx, Rebecca; Thies, Christian; Stiller, Sebastian
  Annual International Conference of the German Operations Research Society (GOR), 2023
  Publisher DOI
• Green batteries for clean skies: Sustainability assessment of lithium-sulfur all-solid-state batteries for electric aircraft
  Barke, Alexander; Cistjakov, Walter; Steckermeier, Dominik; Thies, Christian; Popien, Jan Linus; Michalowski, Peter; Pinheiro Melo, Sofia; Cerdas, Felipe; Herrmann, Christoph; Krewer, Ulrike; Kwade, Arno; Spengler, Thomas Stefan
  Journal of Industrial Ecology 27 (3): 795-810 (2023-06)
  Open Access | Publisher DOI
• Comparative sustainability assessment of lithium-ion, lithium-sulfur, and all-solid-state traction batteries
  Popien, Jan Linus; Thies, Christian; Barke, Alexander; Spengler, Thomas Stefan
  The international journal of life cycle assessment 28: 462–477 (2023)
  Open Access | Publisher DOI
• Comparison of lithium-ion battery supply chains : a life cycle sustainability assessment
  Popien, Jan Linus; Husmann, Jana; Barke, Alexander; Thies, Christian; Cerdas, Felipe; Herrmann, Christoph; Spengler, Thomas Stefan
  Procedia CIRP 116: 131-136 (2023)
  Open Access | Publisher DOI
• Designing robust transformation toward a sustainable circular battery production
  Scheller, Christian; Kishita, Yusuke; Blömeke, Steffen; Thies, Christian; Schmidt, Kerstin; Mennenga, Mark Stephan; Herrmann, Christoph; Spengler, Thomas Stefan
  Procedia CIRP 116: 408-413 (2023)
  Open Access | Publisher DOI
• Evaluation of hydrogen supply options for sustainable aviation
  Ohmstede, Karen; Thies, Christian; Barke, Alexander; Spengler, Thomas Stefan
  in: Buscher, U., Neufeld, J.S., Lasch, R., Schönberger, J. (eds) Logistics Management: 27-42 (2023)
  Publisher DOI
• Linking life cycle sustainability assessment and the sustainable development goals - calculation of goal achievement
  Barke, Alexander; Sodhi, Manbir S.; Thies, Christian; Spengler, Thomas Stefan
  Procedia CIRP 116: 618-623 (2023)
  Open Access | Publisher DOI
• Maintenance, repair, and overhaul of aircraft with novel propulsion concepts : analysis of environmental and economic impacts
  Barke, Alexander; Thies, Christian; Pinheiro Melo, Sofia; Cerdas, Felipe; Herrmann, Christoph; Spengler, Thomas Stefan
  Procedia CIRP 116: 221-226 (2023)
  Open Access | Publisher DOI
• Model-based assessment of the environmental impacts of fuel cell systems designed for eVTOLs
  Pinheiro Melo, Sofia; Toghyani, Somayeh; Cerdas, Felipe; Liu, Xi; Gao, Xin; Lindner, Luisa; Barke, Alexander; Thies, Christian; Spengler, Thomas Stefan; Herrmann, Christoph
  International Journal of Hydrogen Energy 48 (8): 3171-3187 (2023)
  Publisher DOI
• Paris-compliant transformation pathways for the automotive industry
  Kieckhäfer, Karsten; Wansart, Jörg; Thies, Christian; Ginster, Raphael
  ATZ worldwide 125 (10): 52-57 (2023)
  Publisher DOI

2022

• Material and energy flow analysis for environmental and economic impact assessment of industrial recycling routes for lithium-ion traction batteries
  Blömeke, Steffen; Scheller, Christian; Cerdas, Felipe; Thies, Christian; Hachenberger, Rolf; Gonter, Mark; Herrmann, Christoph; Spengler, Thomas
  Journal of Cleaner Production 377: 134344 (2022-12-01)
  Publisher DOI
• Comparison of conventional and electric passenger aircraft for short-haul flights : a life cycle sustainability assessment
  Barke, Alexander; Thies, Christian; Pinheiro Melo, Sofia; Cerdas, Felipe; Herrmann, Christoph; Spengler, Thomas Stefan
  Procedia CIRP 105: 464-469 (2022)
  Open Access | Publisher DOI
• Exploring recycling options in battery supply chains : a life cycle sustainability assessment
  Popien, Jan Linus; Thies, Christian; Spengler, Thomas Stefan
  Procedia CIRP 105: 434-439 (2022)
  Open Access | Publisher DOI
• Life Cycle Engineering Modelling Framework for batteries powering electric aircrafts : the contribution of eVTOLs towards a more sustainable urban mobility
  Pinheiro Melo, Sofia; Cerdas, Felipe; Barke, Alexander; Thies, Christian; Spengler, Thomas Stefan; Herrmann, Christoph
  Procedia CIRP 105 : 368-373 (2022)
  Open Access | Publisher DOI
• Are sustainable aviation fuels a viable option for decarbonizing air transport in Europe? : An environmental and economic sustainability assessment
  Barke, Alexander; Bley, Timo; Thies, Christian; Weckenborg, Christian; Spengler, Thomas Stefan
  Applied Sciences 12 (2): 597 (2022)
  Open Access | Publisher DOI
• Project portfolio planning under CO2 fleet emission restrictions in the automotive industry
  Thies, Christian; Hüls, Christoph; Kieckhäfer, Karsten; Wansart, Jörg; Spengler, Thomas Stefan
  Journal of Industrial Ecology 26 (3): 937-951 (2022-06-01)
  Open Access | Publisher DOI
• Harmonizing ergonomics and economics of assembly lines using collaborative robots and exoskeletons
  Weckenborg, Christian; Thies, Christian; Spengler, Thomas Stefan
  Journal of Manufacturing Systems 62: 681-702 (2022-01-01)
  Publisher DOI

2021

• Activity analysis based modeling of global supply chains for sustainability assessment
  Thies, Christian; Kieckhäfer, Karsten; Spengler, Thomas Stefan
  Journal of Business Economics 91 (2): 215-252 (2021-03)
  Open Access | Publisher DOI
• Exploring the three dimensions of sustainability related to clay cups
  Sangwan, Kuldip Singh; Sodhi, Manbir S.; Spengler, Thomas Stefan; Thies, Christian
  Procedia CIRP 98: 139-144 (2021)
  Open Access | Publisher DOI
• Life cycle sustainability assessment of potential battery systems for electric aircraft
  Barke, Alexander; Thies, Christian; Popien, Jan Linus; Pinheiro Melo, Sofia; Cerdas, Felipe; Herrmann, Christoph; Spengler, Thomas Stefan
  Procedia CIRP 98: 660-665 (2021)
  Open Access | Publisher DOI
• Towards sustainable supply chains for electric mobility
  Thies, Christian
  Springer Gabler 978-3-658-35449-7: 45-61 (2021)
  Publisher DOI

2020

• Limiting CO2 fleet emissions in the automotive industry – a portfolio planning approach
  Hüls, Christoph; Thies, Christian; Kieckhäfer, Karsten; Spengler, Thomas Stefan
  International Journal of Automotive Technology and Management 20 (4): 349-368 (2020)
  Publisher DOI
• Sustainability assessment of products with global supply chains - Methodological contributions and applications to electric mobility
  Thies, Christian
  Technischen Universität Carolo-Wilhelmina zu Braunschweig (2020)
  Publisher DOI
• Sustainability assessment and engineering of emerging aircraft technologies - challenges, methods and tools
  Pinheiro Melo, Sofia; Barke, Alexander; Cerdas, Felipe; Thies, Christian; Mennenga, Mark Stephan; Spengler, Thomas Stefan; Herrmann, Christoph
  Sustainability (Switzerland) 12 (14): 5663 (2020-07)
  Publisher DOI
• Life cycle engineering of future aircraft systems : the case of eVTOL vehicles
  Pinheiro Melo, Sofia; Cerdas, Felipe; Barke, Alexander; Thies, Christian; Spengler, Thomas Stefan; Herrmann, Christoph
  Procedia CIRP 90: 297-302 (2020)
  Open Access | Publisher DOI
• Socio-economic life cycle assessment of future aircraft systems
  Barke, Alexander; Thies, Christian; Pinheiro Melo, Sofia; Cerdas, Felipe; Herrmann, Christoph; Spengler, Thomas Stefan
  Procedia CIRP 90: 262-267 (2020)
  Open Access | Publisher DOI
• Strategische Planung der Antriebsportfoliotransformation von Automobilherstellern
  Hüls, Christoph; Thies, Christian; Spengler, Thomas Stefan; Kieckhäfer, Karsten
  Springer Gabler 978-3-658-29745-9: 81-93 (2020)
  Publisher DOI

2019

• Assessment of social sustainability hotspots in the supply chain of lithium-ion batteries
  Thies, Christian; Kieckhäfer, Karsten; Spengler, Thomas Stefan; Sodhi, Manbir S.
  Procedia CIRP 80: 292-297 (2019)
  Open Access | Publisher DOI
• Operations research for sustainability assessment of products: a review
  Thies, Christian; Kieckhäfer, Karsten; Spengler, Thomas Stefan; Sodhi, Manbir S.
  European Journal of Operational Research 274 (1): 1-21 (2019-04-01)
  Publisher DOI

2018

• Spatially differentiated sustainability assessment of products
  Thies, Christian; Kieckhäfer, Karsten; Spengler, Thomas Stefan; Sodhi, Manbir S.
  Springer 978-3-319-92237-9: 155-163 (2018)
  Publisher DOI
• Spatially differentiated sustainability assessment for the design of global supply chains
  Thies, Christian; Kieckhäfer, Karsten; Spengler, Thomas Stefan; Sodhi, Manbir S.
  Procedia CIRP 69: 435-440 (2018)
  Open Access | Publisher DOI
• Economic assessment of the LithoRec process
  Thies, Christian; Kieckhäfer, Karsten; Hoyer, Claas; Spengler, Thomas Stefan
  In: Kwade, A., Diekmann, J. (eds) Recycling of Lithium-Ion Batteries. Sustainable Production, Life Cycle Engineering and Management: 253-266 (2018)
  Publisher DOI

2016

• Market introduction strategies for alternative powertrains in long-range passenger cars under competition
  Thies, Christian; Kieckhäfer, Karsten; Spengler, Thomas Stefan
  Transportation Research Part D: Transport and Environment 45: 4-27 (2016)
  Publisher DOI