1.
Stoll H, King G, Zeng L. WhatIF: R Software for Evaluating Counterfactuals. J. Stat. Soft. [Internet]. 2005 Dec. 10 [cited 2022 Aug. 9];15(4):1-18. Available from: https://www.jstatsoft.org/index.php/jss/article/view/v015i04