Heterosis and genetic distance in rapeseed (Brassica napus L.). Use of different indicators of genetic divergence in a 7 × 7 diallel Marianne LEFORT-BUSON, Brigitte GUILLOT-LEMOINE and Yvette DA TTÉE Agronomie, 6 9 (1986) 839-844 DOI: 10.1051/agro:19860908