AUTHOR=Schaubroeck Thomas , Schrijvers Dieuwertje , Schaubroeck Simon , Moretti Christian , Zamagni Alessandra , Pelletier Nathan , Huppes Gjalt , Brandão Miguel TITLE=Definition of Product System and Solving Multifunctionality in ISO 14040–14044: Inconsistencies and Proposed Amendments—Toward a More Open and General LCA Framework JOURNAL=Frontiers in Sustainability VOLUME=3 YEAR=2022 URL=https://www.frontiersin.org/journals/sustainability/articles/10.3389/frsus.2022.778100 DOI=10.3389/frsus.2022.778100 ISSN=2673-4524