1. D. M. Aviado, G. B. Koelle andH. Salem,Antitussive Agents, Int. Encyclop. Pharmac. Ther.1, sect. 27 (Pergamon Press 1970).
2. K. Bucher,Pathophysiology and Pharmacology of Cough, Pharmac. Rev.10, 43–58 (1958).
3. K. Bucher,Antitussive Drugs, Physiol. Pharmac. p. 175–200 (Academic Press Inc. 1965).
4. K. Bucher,Activated Expirations in Pigeons, Agents and Actions1, 198–205 (1970).
5. U. Bucher,Respiratory Changes Following Reflexogenic Expiratory Twitches, Agents and Actions3, 61–65 (1973).