1. AHERNE, F.X., BOWLAND, J.P. and LEWIS, A.J. (1977). In Proc. 10th Annual Meet. Rapeseed Association of Canada, Vancouver, pp. 162–175
2. AHLSTROM, B. (1978). In Proc. 5th Int. Rapeseed Conf., Malmo, Vol. 2, pp. 235–239
3. AHLSTROM, B. and THOMKE, S. (1978a). In Proc. 5th Int. Rapeseed Conf., Malmo, Vol. 2, pp. 240–243
4. AHLSTROM, B. and THOMKE, S. (1978b). In Proc. 5th Int. Rapeseed Conf., Malmo, Vol. 2, pp.244–247