@article {Crai:Rupp:rest:2004,
	title = {Restricted Likelihood Ratio Tests in Nonparametric Longitudinal Models},
	journal = {Statistica Sinica},
	volume = {14},
	number = {3},
	year = {2004},
	pages = {713{\textendash}729},
	keywords = {Bootstrap, linear mixed models, non-standard asymptotics, penalized splines, subject-specific curves, Variance components},
	author = {Crainiceanu, C and Ruppert, D.}
}
