1.
Ferwerda J, Hainmueller J, Hazlett CJ. Kernel-Based Regularized Least Squares in R (KRLS) and Stata (krls). J. Stat. Soft. [Internet]. 2017 Jul. 13 [cited 2024 Apr. 25];79(3):1-26. Available from: https://www.jstatsoft.org/index.php/jss/article/view/v079i03