Narcotic agonist and antagonist potencies of a homologous series of "N" - alkyl - norketobemidones measured by the guinea - pig ileum and mouse vas deferens methods Hans W Kosterlitz, Frances M Leslie and Angela A Waterfield, 'Narcotic agonist and antagonist potencies of a homologous series of "N" - alkyl - norketobemidones measured by the guinea - pig ileum and mouse vas deferens methods', reprinted from 'Journal of Pharmacy and Pharmacology', 27 (1975), 73 - 78. 1975