1. BROWN, I.N., IMMUNITY TO MALARIA - ANTIBODY RESPONSE TO ANTIGENIC VARIATION BY PLASMODIUM KNOWLESI, IMMUNOLOGY 14: 127 (1968).
2. CHARMAN, H.P., EQUINE INFECTIOUS-ANEMIA VIRUS - EVIDENCE FAVORING CLASSIFICATION AS A RETRA-VIRUS, JOURNAL OF VIROLOGY 19: 1073 (1976).
3. FRANCIS, T, A SEROLOGICAL RECAPITULATION OF HUMAN INFECTION WITH DIFFERENT STRAINS OF INFLUENZA VIRUS, TRANSACTIONS OF THE ASSOCIATION OF AMERICAN PHYSICIANS 66: 231 (1953).
4. Georgsson, G., Acta Neuropathologica 37: 127 (1977).
5. GUDNADOTTIR, M, VISNA-MAEDI IN SHEEP, PROGRESS IN MEDICAL VIROLOGY 18: 336 (1974).