1. Bernsreiter, M.: J. Amer. med. Ass. 170, 1628 (1959)
2. Booth, B. H., Patterson R , J. Amer. med. Ass. 211, 627 (1970)
3. Castberg, T., Schwartz, M.: Acta med. scand. 86, 459 (1947)
4. Criep, L. H.: Arch, intern. Med. 48, 1098 (1931)
5. Criep, L. H., Woehler, T. E.: Ann. Allergy 29, 399 (1971)