1. 1887-Weinzierl, T., Zeits. Nahr. Unters. Hyg.1: 117–126.
2. 1894-Kraemer, H., Proc. Am. Pharm. Assoe.42: 159–167; Am. Jour. Pharm. 66: 479–86.
3. 1895-Day, W. B., Proc. Am. Pharm. Assoc.43: 200–203.
4. 1897-Kebler, L. F. and LaWall, C. H., Am. Jour. Pharm.69: 244–250.
5. —Kraemer, H., Am. Jour. Pharm.69: 523–533; Proc. Am. Pharm. Assoc. 45: 215-219.