@article{article81222242,
title   = {A SAS macro for estimating transition probabilities in semiparametric models for recurrent events},
author = {Paes, Angela Tavares and Lima, Antonio Carlos Pedroso de},
year = {2004},
doi = {10.1016/j.cmpb.2003.08.007},
journal   = {Computer Methods and Programs in Biomedicine}
}