Moreira, Carla, Jacobo de Uña-Álvarez, and Rosa M. Crujeiras. “DTDA: An R Package to Analyze Randomly Truncated Data”. Journal of Statistical Software 37, no. 7 (November 17, 2010): 1–20. Accessed August 8, 2022. https://www.jstatsoft.org/index.php/jss/article/view/v037i07.