Biotechnology and ecology of pollen : proceedings of the International Conference on the Biotechnology and Ecology of Pollen, 9-11 July 1985, University of Massachusetts, Amherst, MA, U.S.A. - Mulcahy, David L.; Bergamini Mulcahy, Gabriella; Ottaviano, Ercole (New York-Berlin-Heidelberg : Springer-Verlag, 1986)