1987
- Frencel I., Lewartowska E., Jędryczka M., Sergot A., Motała G. Estimation methods and resistance of winter rape cultivars to the stem canker (Phoma lingam, Leptosphaeria maculans) is a glasshouse test and in field trials, resembling natural infection conditions. VIIth International Rapeseed Congress, Poznań, 11-14.05.1987. Proceedings: 1210-1215.