To cite frailtyEM in publications use:
Balan TA, Putter H (2019).“frailtyEM: An R Package for Estimating Semiparametric Shared Frailty Models.”Journal of Statistical Software,90(7), 1–29.doi:10.18637/jss.v090.i07.
Corresponding BibTeX entry:
@Article{, title = {{frailtyEM}: An {R} Package for Estimating Semiparametric Shared Frailty Models}, author = {Theodor Adrian Balan and Hein Putter}, journal = {Journal of Statistical Software}, year = {2019}, volume = {90}, number = {7}, pages = {1--29}, doi = {10.18637/jss.v090.i07}, }