1. Studies of unidentified chick growth factors;Combs;J. Biol. Chem.,1950
2. Relation of growth stimulating properties of antibiotics to unidentified growth factors required by the chick;Groschke;Poultry Sci.,1950
3. An unknown nutritive factor in feeds of animal origin;Heuser;Poultry Sci.,1951
4. Studies on an unidentified growth promoting factor in cereals and other natural products;Hill;Poultry Sci.,1950
5. Evidence for an unidentified chick growth factor in the presence of vitamin B12;Menge;Poultry Sci.,1949