de Almeida, J.C., Bettencourt, A., Costa, C.S. and de Almeida, J.M. 1995. The curative surgery of periampullary tumors. The results of 48 resections. Acta Médica Portuguesa. 8, (Dec. 1995), S35–9. DOI:https://doi.org/10.20344/amp.2781.