Voronca, D. C., Gebregziabher, M., Durkalski-Mauldin, V., Liu, L. and Egede, L. E. (2018) “MTPmle: A SAS Macro and Stata Programs for Marginalized Inference in Semi-Continuous Data”, Journal of Statistical Software, 87(6), pp. 1–24. doi: 10.18637/jss.v087.i06.