@ARTICLE {CROUCH:1995, title = {Genetic diversity of wild, weedy and cultivated acccessions of Brassica rapa}, author = {Crouch, J. H. and Lewis, B. G. and Lydiate, D. J. and Mithen, R. F. }, journal = {Heredity}, year = {1995}, volume = {74}, pages = {491--496}, }