TY - JOUR TI - Urban ecosystem health assessment based on emergy and set pair analysis—A comparative study of typical Chinese cities PY - 2009 AU - M. R. Su AU - Z. F. Yang AU - B. Chen AU - S. Ulgiati T2 - Ecological Modelling LK - http://www.sciencedirect.com/science/article/pii/S0304380009003974 DO - 10.1016/j.ecolmodel.2009.06.010 ER -