Yadav, R., H. Yadav, and T. K. Leong. “Factors Influencing Acute Exacerbation of Bronchial Asthma Among Children in Malaysia”. International Journal of Child Health and Nutrition, vol. 3, no. 1, Mar. 2014, pp. 11-16, doi:10.6000/1929-4247.2014.03.01.2.