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Eltze M (1979). “Investigations on the mode of action of a new antihypertensive drug, urapidil, in the isolated vas deferens”. Eur. J. Pharmacol.59 (1–2): 1–9. doi:10.1016/0014-2999(79)90018-9. PMID228944.
Ramage AG (1990). “Influence of 5-HT1A receptor agonists on sympathetic and parasympathetic nerve activity”. J. Cardiovasc. Pharmacol.15: S75–S85. doi:10.1097/00005344-199001001-00010. PMID1702490.