Stewien, K. E.; Durigon, E. L.; Tanaka, H.; Gilio, A. E.; Baldacci, E. R. Occurrence of Human Astrovirus in S. Paulo City, Brazil . Rev. saúde pública 1991, 25 (2), 157-158. https://doi.org/10.1590/S0034-89101991000200011.