1. Sporadic diffuse Osteoperiostitis of fowls.;Pugh;Vet. Rec.,1927
2. A condition resembling osteopetrosis (marble bone) in common fowl.;Jungherr;Storrs Agr. Exp. Sta. Bul.,1938
3. II.;Frederickson;Development of strains by serial passage in line 15 I chickens. Avian. Dis.,1965
4. Campbell , J. G. 1954 Avian leucosis: A plea for classification Tenth World Poultry Congress Edinburgh. Section papers