Häggström, J., Persson, E., Waernbaum, I. and de Luna, X. 2015. CovSel: An R Package for Covariate Selection When Estimating Average Causal Effects. Journal of Statistical Software. 68, 1 (Nov. 2015), 1–20. DOI:https://doi.org/10.18637/jss.v068.i01.