1. Balasecu, M., G. A. Stefanescu and I. Oeriu 1971. Action of Folcystein on fertility of eggs, in VIII World Congress on Fertility and Sterility, 1971. Tokyo/Kyota. Abstracts. Amsterdam, Netherlands. Excerpta Medica. 45.
2. On the study of some productive characters in geese under the conditions of large scale production;Balko;Vedecke Prace Vyskummy Ustav Pre Chov Hydiny,1967
3. Investigation of egg fertility during the initial laying period in geese;Bielinska;Postepy Drobiarstwa,1970
4. Effect of sugar beet in the diet on egg hatchability;Bielinska;Baromfiipar,1971
5. The effect of egg weight and storage time on length of incubation period of goslings;Bielinska;Postepy Drobiarstwa,1973