Wallace, B. C., Dahabreh, I. J., Trikalinos, T. A., Lau, J., Trow, P. and Schmid, C. H. (2012) “Closing the Gap between Methodologists and End-Users: R as a Computational Back-End”, Journal of Statistical Software, 49(5), pp. 1–15. doi: 10.18637/jss.v049.i05.