Wojtyś M, Marra G, Radice R. Copula Regression Spline Sample Selection Models: The R Package SemiParSampleSel. J. Stat. Soft. [Internet]. 2016 Aug. 1 [cited 2024 Apr. 19];71(6):1-66. Available from: https://www.jstatsoft.org/index.php/jss/article/view/v071i06