1. Alissa A, Sericys H, Jonard R (1985) Physiologic végétale, C R Acad Sc Paris, 300. Série III, 1, 25–30
2. Atalagic J, Dozet B, Skoric D (1993) Plant Breeding 111: 318–324
3. Barth S, Voeste D, Schnabl H (1993) Bot Acta 106:100–102
4. Bohorova N, Atanassov A, and Georgieva-Todorova J (1985) Z Pflanzenzüchtung 95: 35–44
5. Colby LW and Peirce LC (1988) Hortscience 23:761–763