MONACO, John V.; GORFINE, Malka; HSU, Li. General Semiparametric Shared Frailty Model: Estimation and Simulation with frailtySurv. Journal of Statistical Software, [S. l.], v. 86, n. 4, p. 1–42, 2018. DOI: 10.18637/jss.v086.i04. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v086i04. Acesso em: 21 mar. 2026.