M. Jan, M. A. Mughal, R. K. Tanwani, K. Aamir, and M. Ali, “EVALUATION OF COMBINED EFFECT OF VERAPAMIL AND RANITIDINE ON THE VOLUME AND ACIDITY OF CARBACHOL INDUCED GASTRIC SECRETION”, J Ayub Med Coll Abbottabad, vol. 16, no. 2, May 2004.