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2. Studies on the localization of central cough mechanisms: Site of action of antitussive drugs;Chou;J. Pharmacol. Exp. Ther.,1975
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4. Acute toxicity of propoxyphene salts;Emmerson;Toxicol. Appl. Pharmacol.,1971
5. Plasma codeine and morphine concentrations after therapeutic oral doses of codeine-containing analgesics;Findlay;Clin. Pharmacol. Ther.,1978