@article{martin_current_1976,
	title = {Current {Research} on {Open} {Space}, {Nongrading}, {Vertical} {Grouping}, and {Team} {Teaching}},
	volume = {57},
	issn = {0031-7217},
	url = {https://sci-hub.st/10.2307/20298259},
	language = {eng},
	number = {5},
	journal = {The Phi Delta Kappan},
	author = {Martin, Lyn S. and Pavan, Barbara N.},
	month = jan,
	year = {1976},
	pages = {310--315}
}

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