%0 Generic %D 1987 %T Direct Effects of Sulphur on Forests in Europe - a Regional Model of Risk %A Makela, A. %A Materna, J. %A Schoop, W. %B International Institute for Applied Systems Analysis (WP-87-57) %I International Institute for Applied Systems Analysis %C Luxembourg %U http://webarchive.iiasa.ac.at/Admin/PUB/Documents/WP-87-057.pdf