Proc. of the Symp. on Res. into agro-technical methods aiming at increasing the productivity of crops --- arganized by The Agr. Section of the United Nations Economic Commission for Europe. Held at Geneve, Switzerland, 17-21 January 1983
(1983)
Proceedings of the 1 International Symposium on genetic aspects of plant nutrition organised by the Serbian Acad. of Sciences and Arts, Belgrade, August 30 - September 4, 1982
(1983)