Voronca, D. C., M. Gebregziabher, V. Durkalski-Mauldin, L. Liu, and L. E. Egede. “MTPmle: A SAS Macro and Stata Programs for Marginalized Inference in Semi-Continuous Data”. Journal of Statistical Software, vol. 87, no. 6, Nov. 2018, pp. 1-24, doi:10.18637/jss.v087.i06.