DiamondA.SekhonJ. S. (2013). Genetic matching for estimating causal effects: A general multivariate matching method for achieving balance in observational studies. Review of Economics and Statistics, 95, 932–945.
2.
HansenB. B.KlopferS. O. (2012). Optimal full matching and related designs via network flows. Journal of Computational and Graphical Statistics, 15, 609–627.