1. Physiological explanations of heterosis;Andreasen,1981
2. Crossbreeding of dairy cattle;Christensen,1988
3. Crossbreeding Red Danish, Holstein-Friesian and Finnish Ayrshire cattle;Christensen,1984
4. Experimental approaches in utilizing breed resources;Dickerson;Anim. Breed. Abstr.,1969
5. Inbreeding and heterosis in animals;Dickerson,1972