Binh, N. V., Lan, P. T., Tinh, P. T., & Nguyen, T. M. N. (2023). Description of the First Pandemic Influenza A (H1N1) Cases in Vietnam, June-July 2009. Outbreak, Surveillance, Investigation & Response (OSIR) Journal, 3(1), 10–13. https://doi.org/10.59096/osir.v3i1.263363