Shaukat, Asma, et al. “IN VITRO RESPONSE OF TRACHEAL SMOOTH MUSCLE FROM HYPERRESPONSIVE GUINEA PIGS TO CELIPROLOL”. Journal of Ayub Medical College Abbottabad, vol. 24, no. 3-4, Dec. 2012, pp. 85-86, https://jamc.ayubmed.edu.pk/index.php/jamc/article/view/1937.