Fischer, G. <https://pure.iiasa.ac.at/view/iiasa/89.html> & Heilig, G.K. <https://pure.iiasa.ac.at/view/iiasa/1318.html>  (1996).  Population Momentum and the Demand on Land and Water Resources.   IIASA Working Paper. IIASA, Laxenburg, Austria: WP-96-149