TY - JOUR TI - A multi-level framework for metabolism in urban energy systems from an ecological perspective PY - 2018 AU - Paola Pulido Barrera AU - Jesús Rosales Carreón AU - Hugo J. de Boer T2 - Resources, Conservation and Recycling LK - http://www.sciencedirect.com/science/article/pii/S0921344917301192 DO - 10.1016/j.resconrec.2017.05.005 ER -