Ginestal-Cruz, A., Grima, N., Correia, A. P., Duarte, V. and Correia, J. P. (1990) “Endoscopic sphincterotomy in choledocholithiasis: analysis of an experience of 530 interventions”., Acta Médica Portuguesa. Lisbon, Portugal, 3(3), pp. 133–40. doi: 10.20344/amp.4563.