@article {heckman2012,
	title = {The theory and application of penalized methods or Reproducing Kernel Hilbert Spaces made easy},
	journal = {Statist. Surv.},
	volume = {6},
	year = {2012},
	pages = {113{\textendash}141},
	publisher = {The American Statistical Association, the Bernoulli Society, the Institute of Mathematical Statistics, and the Statistical Society of Canada},
	doi = {10.1214/12-SS101},
	url = {http://dx.doi.org/10.1214/12-SS101},
	author = {Heckman, Nancy}
}
