1. Effect of vitamin B12 animal protein factor and soil for pig growth;Cunha;Arch. Biochem.,1949
2. Effect of vitamin B12 and A.P.F. supplement on methionine needs of the pig;Cunha;Arch. Biochem.,1949
3. Effect of animal protein factor on lowering protein needs of the pig;Cunha;Arch. Biochem.,1950
4. Mutants of Escherichia coli requiring methionine or vitamin B12;Davis;J. Bact.,1950
5. Relation of growth stimulating properties of antibiotics to unidentified growth factors required by the chick;Groschke;Poultry Sci.,1950