Mathematical modelling of environmental and ecological systems : excerpts from an International Symposium on Mathematical Modelling of Ecological, Environmental, and Biological Systems, held from August 27th-30th, 1985, in Kanpur, India - Shukla, J. B.; Hallam, T. G. (Thomas G.); Capasso, Vincenzo, 1945- (Developments in environmental modelling, 1987)