[proceedings of a seminar organized by the Commission of the European Communities, Directorate-General [for] Science, Research and Development, Environment Research Programme, held in Münster, Federal Republic of Germany, 11-13 April 1984] ; edited by R. Leschber, R.D. Davis, P. L'Hermite
edited by W. Burke, D. Gabriels, [and] J. Bouma ; sponsored by the Commission of the European Communities, Directorate-General for Agriculture, Coordination of Agricultural Research