Intentionally incomplete longitudinal designs: I. Methodology and comparison of some full span designs. Helms, R. W. Statistics in Medicine, 11(14-15):1889–1913, 1992. no copy
Intentionally incomplete longitudinal designs: I. Methodology and comparison of some full span designs [link]Paper  doi  bibtex   
@article{helms_intentionally_1992,
	title = {Intentionally incomplete longitudinal designs: {I}. {Methodology} and comparison of some full span designs},
	volume = {11},
	issn = {02776715, 10970258},
	shorttitle = {Intentionally incomplete longitudinal designs},
	url = {http://doi.wiley.com/10.1002/sim.4780111411},
	doi = {10.1002/sim.4780111411},
	language = {en},
	number = {14-15},
	urldate = {2017-11-10},
	journal = {Statistics in Medicine},
	author = {Helms, Ronald W.},
	year = {1992},
	note = {no copy},
	pages = {1889--1913}
}

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