Small sample inference for fixed effects from restricted maximum likelihood. Kenward, M. G. & Roger, J. H. Biometrics, 53(3):983–997, 1997.
bibtex   
@article{kenward_small_1997,
	title = {Small sample inference for fixed effects from restricted maximum likelihood},
	volume = {53},
	number = {3},
	journal = {Biometrics},
	author = {Kenward, M. G. and Roger, J. H.},
	year = {1997},
	pages = {983--997}
}
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