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Patel MV, Kolasa T, Mortell K, Matulenko MA, Hakeem AA, Rohde JJ, et al. (December 2006). "Discovery of 3-methyl-N-(1-oxy-3',4',5',6'-tetrahydro-2'H-[2,4'-bipyridine]-1'-ylmethyl)benzamide (ABT-670), an orally bioavailable dopamine D4 agonist for the treatment of erectile dysfunction". Journal of Medicinal Chemistry. 49 (25): 7450–7465. doi:10.1021/jm060662k. PMID17149874.
Cowart M, Latshaw SP, Bhatia P, Daanen JF, Rohde J, Nelson SL, et al. (July 2004). "Discovery of 2-(4-pyridin-2-ylpiperazin-1-ylmethyl)-1H-benzimidazole (ABT-724), a dopaminergic agent with a novel mode of action for the potential treatment of erectile dysfunction". Journal of Medicinal Chemistry. 47 (15): 3853–3864. doi:10.1021/jm030505a. PMID15239663.
Patel MV, Kolasa T, Mortell K, Matulenko MA, Hakeem AA, Rohde JJ, et al. (December 2006). "Discovery of 3-methyl-N-(1-oxy-3',4',5',6'-tetrahydro-2'H-[2,4'-bipyridine]-1'-ylmethyl)benzamide (ABT-670), an orally bioavailable dopamine D4 agonist for the treatment of erectile dysfunction". Journal of Medicinal Chemistry. 49 (25): 7450–7465. doi:10.1021/jm060662k. PMID17149874.