1. BELL, W.B., VIRGINIA J SCI 3: 77 (1943).
2. OLAFSON, P, CORNELL VET 37: 195 (1947).
3. OLAFSON, P, THE EXPERIMENTAL PRODUCTION OF HYPERKERATOSIS (X-DISEASE) BY FEEDING A PROCESSED CONCENTRATE, CORNELL VETERINARIAN 41: 107 (1951).
4. OLSON, C, ATTEMPTS TO PRODUCE BOVINE HYPERKERATOSIS, AMERICAN JOURNAL OF VETERINARY RESEARCH 12: 261 (1951).
5. WAGENER, K, HYPERKERATOSIS OF CATTLE IN GERMANY, JOURNAL OF THE AMERICAN VETERINARY MEDICAL ASSOCIATION 119: 133 (1951).