1. Coupar IM, Hedges A, Metcalfe HL, Turner P. Effect of aminophylline, butalamine and imolamine on human isolated smooth muscle. J Pharm Pharmacol. 1969 Jul;21(7):474-5. doi: 10.1111/j.2042-7158.1969.tb08294.x. 11(1):31-8. doi: 10.1016/s0031-6989(79)80095-8.