1. BOLLAG, W, EFFECTS OF VITAMIN-A ACID (NSC-122758) ON TRANSPLANTABLE AND CHEMICALLY INDUCED TUMORS, CANCER CHEMOTHERAPY REPORTS PART 1 55: 53 (1971).
2. BOLLAG, W, PROPHYLAXIS OF CHEMICALLY INDUCED BENIGN AND MALIGNANT EPITHELIAL TUMORS BY VITAMIN-A ACID (RETINOIC ACID), EUROPEAN JOURNAL OF CANCER 8: 689 (1972).
3. CHU, E.W., AN INHIBITORY EFFECT OF VITAMIN A ON INDUCTION OF TUMORS OF FORESTOMACH AND CERVIX IN SYRIAN HAMSTER BY CARCINOGENIC POLYCYCLIC HYDROCARBONS, CANCER RESEARCH 25: 884 (1965).
4. COHEN, B.E., VITAMIN-A - ADJUVANT AND STEROID ANTAGONIST IN IMMUNE-RESPONSE, JOURNAL OF IMMUNOLOGY 111: 1376 (1973).
5. DAVIES, R.E., EFFECT OF VITAMIN A ON 7,12-DIMETHYLBENZ(ALPHA)ANTHRACENE-INDUCED PAPILLOMAS IN RHINO MOUSE SKIN, CANCER RESEARCH 27: 237 (1967).