1. Investigations on blood groups of the pig;Andresen;Nord. Vet. Med.,1957
2. Blood groups in pigs;Andresen;Ann. N. Y. Acad. Sci.,1962
3. Minus-minus (-/-) EaEd phenotypes and new allele Eeg (= E7) in pigs of the Hampshire breed;Andresen;Vox Sang.,1965
4. The blood group system of the pig;Andresen;Nord. Vet. Med.,1959
5. E red cell system in pigs: Irregular genetic transmission;Baker;Vox Sang.,1971