@article{article00e62004,
title   = {Retrorectal tumors complicating pergnancy},
author = {Sobrado, Carlos W and Mester, Marcelo and Simonsen, Oscar S and Justo, Claudia R and Abreu, José N and Habr Gama, Angelita},
year = {1996},
doi = {10.1007/bf02081422},
journal   = {Diseases of the Colon & Rectum}
}