Bastos, Flávia Corrêa, et al. “FREQUENCY OF Shigella Flexneri SEROTYPES ISOLATE D IN THE STATE OF PARÁ, BRAZIL (1979-2009)”. Revista De Patologia Tropical Journal of Tropical Pathology, vol. 41, no. 3, Oct. 2012, doi:10.5216/rpt.v41i3.20751.