1. Multiple births is Norwegian cattle;Auran;Acta Agric. Scand.,1974
2. Twinning in Israeli-Friesian dairy herds;Bar-Anan;Anim. Prod.,1974
3. Inheritance of twinning in a herd of Holstein-Friesian cattle;Erb;J. Darity Sci.,1960
4. Factors affecting prolificacy of cattle. II. Some evidence that certain reproductive traits are additively inherited;Erd;Wash. Agr. Exp. Sta. Tech. Bull.,1959
5. Zwillingsgeburten;Gaillard;Mitt. Schweiz. Verb. Künstl. Bes.,1973