Ahad, Abdul, M. Perwaiz Sandila, Nadeem Ahmed Siddiqui, and Syed Tousif Ahmed. 2003. “EXERCISE -INDUCED BRONCHOSPASM IN MALE ATHLETES AT KARACHI”. Journal of Ayub Medical College Abbottabad 15 (4). https://www.jamc.ayubmed.edu.pk/index.php/jamc/article/view/3992.