To cite KRLS in publications use:
Ferwerda J, Hainmueller J, Hazlett CJ (2017). “Kernel-Based Regularized Least Squares in R (KRLS) and Stata (krls).” Journal of Statistical Software, 79(3), 1–26. doi:10.18637/jss.v079.i03.
Corresponding BibTeX entry:
@Article{, title = {Kernel-Based Regularized Least Squares in {R} ({KRLS}) and {Stata} ({krls})}, author = {Jeremy Ferwerda and Jens Hainmueller and Chad J. Hazlett}, journal = {Journal of Statistical Software}, year = {2017}, volume = {79}, number = {3}, pages = {1--26}, doi = {10.18637/jss.v079.i03}, }