Naveed Inayat, Rashid Ahmed Khan, Anwar Ahmed Shaikh, Rubina Sahito. “Treatment of Acute Severe Asthma by Intravenous Magnesium Sulfate in Patients Non-Responsive to Established Therapy”. Journal of Peoples University of Medical &Amp; Health Sciences Nawabshah. (JPUMHS), vol. 6, no. 4, Dec. 2016, pp. 197-02, http://121.52.155.46/index.php/ojs/article/view/251.