1. Whitby, Lancet 1: 1210 (1938).
2. Wien, Quart. Jour. Pharmacy and Pharmacology 11: 217 (1938).
3. Marshall, Jour. Am. Med. Assn. 110: 252 (1938).
4. Marshall, Bulletin Johns Hopkins Hosp. 63: 318 (1938).
5. Finestone, Bulletin Johns Hopkins Hosp. 62: 565 (1938).