keshavarzi, fatemeh. “Study of Klebsiella Pneumonia Antibiotic-Resistance of K1 and K2 Serotypes in Nosocomial Infections With Hospital Origin”. Internal Medicine and Medical Investigation Journal 4, no. 4 (February 11, 2020). Accessed April 6, 2020. http://imminv.com/index.php/imminv/article/view/244.