Voronca, Delia C., Mulugeta Gebregziabher, Valerie Durkalski-Mauldin, Lei Liu, and Leonard E. Egede. 2018. “MTPmle: A SAS Macro and Stata Programs for Marginalized Inference in Semi-Continuous Data”. Journal of Statistical Software 87 (6):1-24. https://doi.org/10.18637/jss.v087.i06.