1. Andresen, E.: A study of blood groups of the pig. Thesis, Copenhagen 1963.
2. Ashton, G. C.: Serum protein variations in horses. Nature (Lond.) 1958, 182, 1029–1030.
3. Bernstein, F.: Variations- und Erblichkeitsstatistik. In, Handbuch der Vererbungswissenschaft, Vol. 1 C, Gebr. Borntraeger, Berlin 1929.
4. Brummerstedt-Hansen, E., J. Moustgaard & I. Møller: Serum-transferrin-polymorphism in Danish cattle breeds. Kgl. Vet.- og Landbohøjsk., Årsskrift 1963, 13–26.
5. Bruner, D. W., E. F. Hull & E. R. Doll: The relationship of blood factors to icterus in foals. Amer. J. vet. Res. 1948, 9, 237–242.