Hutagalung, J., Halim, W. and Koto, A. 2011. Dengue Hemorrhagic Fever in West Sumatera, Indonesia, 2009. Outbreak, Surveillance, Investigation & Response (OSIR) Journal. 4, 2 (Dec. 2011), 1–5. DOI:https://doi.org/10.59096/osir.v4i2.263353.