@article{singer_using_1998,
	title = {Using {SAS} {PROC} {MIXED} to fit multilevel models, hierarchical models, and individual growth models},
	volume = {23},
	number = {4},
	journal = {Journal of Educational and Behavioral Statistics},
	author = {Singer, J. D.},
	year = {1998},
	pages = {323}
}

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