@book{19561,
	author = {Je Cho, Sung},
	title = {The Proceedings of the 12th International Congress on Mathematical Education: Intellectual and attitudinal challenges},
	url = {https://library.oapen.org/bitstream/20.500.12657/28000/1/1001997.pdf||https://library.oapen.org/bitstream/20.500.12657/28000/1/1001997.pdf||https://library.oapen.org/bitstream/20.500.12657/28000/1/1001997.pdf}
}