González, P., A. Sánches, P. Rivera, C. Jiménez, and F. Hemández. “Rotavirus and Coronavirus Outbreak: Etiology of Annual Diarrhea in Costa Rican Children”. Revista De Biología Tropical, vol. 45, no. 3, Sept. 1997, pp. 989–991, https://revistas.ucr.ac.cr/index.php/rbt/article/view/21087.