1. M. Heun, Agricultural University of Norway, Department of Biotechnological Sciences, Postal Office Box 5040, 1432 As, Norway.
2. R. Schäfer-Pregl and F. Salamini, Max-Planck-Institut Züchtungsforschung, Carl-von-Linné-Weg 10, D-50829 Köln, Germany.
3. D. Klawan, University of Hamburg, Department of Psychology, von-Melle-Park 6, D-20146 Hamburg, Germany.
4. R. Castagna, M. Accerbi, B. Borghi, Istituto Sperimentale Cerealicoltura, Via Mulino 3, I-20079 Sant'Angelo Lodigiano (Milano), Italy.