TY - JOUR TI - The water–food–energy nexus: an introduction to nexus concepts and some conceptual and operational problems PY - 2015 AU - Tony Allan AU - Martin Keulertz AU - Eckart Woertz T2 - Factor X: Challenges, Implementation Strategies and Examples for a Sustainable Use of Natural Resources LK - https://doi.org/10.1080/07900627.2015.1029118 DO - 10.1080/07900627.2015.1029118 ER -