English: Cavalla, J. F.; Jones, R.; Welford, M.; Wax, J.; Winder, C. V. (1964). "Analgetics Based on the Pyrrolidine Ring. III". Journal of Medicinal Chemistry. 7 (4): 412–415. doi:10.1021/jm00334a005.
John Frederick Cavalla & Alan Chapman White, DE1272296 (1968 to Parke Davis and Co LLC).
Cavalla John Frederick, US3149123 (1964 to Parke Davis and Co LLC).
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