Fedra, K. <https://pure.iiasa.ac.at/view/iiasa/1241.html>  (1994).  Models, GIS, and expert systems: integrated water resources models.    In:  Applications of geographic information systems in hydrology and water resources management. Eds. Kovar, K. & Nachtnebel, H.P., pp. 297-308 Vienna, Austria: IAHS Press.  ISBN 0 947571 48 5