Mahdi, Estabraq M. 2009. “The Effect of Continuous Darkness and Continuous Light on the Reactivity of Smooth Muscles to Drugs in the Rat Vas Deferens”. AL-Kindy College Medical Journal 5 (1): 47-51. https://jkmc.uobaghdad.edu.iq/index.php/MEDICAL/article/view/723.