C. Hutasoit, M. K. Dj., R. M. Daulay, H. M. Lubis, and Z. Siregar, “Bronchopneumonia with measles in Infants and Children at the Department of Child Health School of Medicine, University of North Sumatera/ Dr. Pirngadi Hospital Medan (January 1985 - December 1989)”, PI, vol. 31, no. 9-10, pp. 273–80, Feb. 2019.