@article{article6fbaff9b,
title   = {Paternity after vasectomy with two previous semen analyses without spermatozoa},
author = {Lucon, Marcos and Lucon, Antonio Marmo and Pasqualoto, Fabio Firmbach and Srougi, Miguel},
year = {2007},
doi = {10.1590/s1516-31802007000200011},
journal   = {São Paulo Medical Journal}
}