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3. The utility of artificially induced cough as a clinical model for evaluating long-lasting antitussive drug combinations;Packman;Am Pharm,1983
4. The utility of artificially induced cough as clinical model for evaluating antitussive combinations. Part 1: Liquid and solid formulations of systemic drugs;Packman;Curr Ther Res,1977
5. Comparison of the antitussive effects of codeine phosphate 20 mg, dextromethorphan 30 mg and noscapine 30 mg using citric acid induced cough in normal subjects;Empey;Eur J clin Pharmac,1979