@article {Jia202049,
	title = {Voluntary participation and natural grouping with smartphones: An effective and practical approach to implement a quasi-experiment},
	journal = {International Journal of Mobile Learning and Organisation},
	volume = {14},
	number = {1},
	year = {2020},
	note = {cited By 2},
	pages = {49-62},
	doi = {10.1504/IJMLO.2020.103935},
	url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-85076225627\&amp;doi=10.1504\%2fIJMLO.2020.103935\&amp;partnerID=40\&amp;md5=d46fbca5defcb8b032415cba63ca2950},
	author = {Jia, J. and Z. Chen}
}
