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Neubig, Richard R.; Spedding, Michael; Kenakin, Terry; Christopoulos, Arthur; International Union of Pharmacology Committee on Receptor Nomenclature and Drug, Classification. (December 2003). "International Union of Pharmacology Committee on Receptor Nomenclature and Drug Classification. XXXVIII. Update on Terms and Symbols in Quantitative Pharmacology". Pharmacological Reviews. 55 (4): 597–606. doi:10.1124/pr.55.4.4. PMID14657418. S2CID1729572.