Vock, D., Davidian, M. and Tsiatis, A. 2014. SNP_NLMM: A SAS Macro to Implement a Flexible Random Effects Density for Generalized Linear and Nonlinear Mixed Models. Journal of Statistical Software, Code Snippets. 56, 2 (Jan. 2014), 1–21. DOI:https://doi.org/10.18637/jss.v056.c02.