Cetinkaya, Merih, et al. “Human 2009 Influenza A (H1N1) Virus Infection in a Premature Infant Born to an H1N1-Infected Mother: Placental Transmission?”. The Turkish Journal of Pediatrics, vol. 53, no. 4, Aug. 2011, pp. 441-4, https://turkjpediatr.org/article/view/1797.