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2. The up-and-down method with small samples;Brownlee;J. Am. Statist. Assoc.,1953
3. A method for determining loss of pain sensation;D'Amour;J. Pharmacol. Exptl. Therap.,1941
4. Experimentelle Prüfung schmerzstillender Mittel;Haffner;Deut. Med. Wochschr.,1929
5. Studies on the addiction-liability of rats to some analgesic. I. Withdrawal symptoms of morphinized rats;Hosoya;Folia Pharmacol. Japon.,1958