Teaching problem solving through cooperative grouping. Part 1: Group versus individual problem solving. Heller, P., Keith, R., & Anderson, S. American Journal of Physics, 60:627–627, 1992.
Teaching problem solving through cooperative grouping. Part 1: Group versus individual problem solving [link]Paper  doi  bibtex   
@article{heller_teaching_1992,
	title = {Teaching problem solving through cooperative grouping. {Part} 1: {Group} versus individual problem solving},
	volume = {60},
	url = {https://doi.org/10.1119/1.17117},
	doi = {10.1119/1.17117},
	journal = {American Journal of Physics},
	author = {Heller, Patricia and Keith, Ronald and Anderson, Scott},
	year = {1992},
	pages = {627--627},
}

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