de Almeida, A.M., Aldeia, F.J., dos Santos, N.M. and Gracias, C.W. 1984. Operative cholangiography cost-effectiveness--routine versus selective utilization. Acta Médica Portuguesa. 5, 7-8 (Aug. 1984), 211–217. DOI:https://doi.org/10.20344/amp.3750.