Pellegrino, J., and J. M. Pompeu Memoria. “The Intradermal Test in Schistoscmiasis Mansonl. V. Delayed Cutaneous Response”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 2, no. 5, Oct. 1960, pp. 265-7, https://revistas.usp.br/rimtsp/article/view/203025.