Proceedings of the first ISHS symposium on In vitro culture and horticultural breeding : Cesena (Italy): May, 30 - June 3, 1989 / [convener: S. Sansavini ; eds. J. Janick, R.H. Zimmerman]Forum on strategies for horticultural societies in the 1990's : 23rd International Horticultural Congress, Florence, Italy August 30, 1990 / ed. G.C. Martin, S. Sansavini