Wang HS, Gao MS, Li S (December 2003). "[Application of primacaine in operative dentistry: analysis of clinical results]". Shanghai Kou Qiang Yi Xue = Shanghai Journal of Stomatology (in Chinese). 12 (6): 452, 459. PMID14966589.
patents.google.com
Raymond O Clinton, Stanley C Laskowski, U.S. patent 2,882,296 (1959 to Sterling Drug Inc).