@book{16162,
	author = {Kaiser, Gabriele},
	title = {Proceedings of the 13th International Congress on Mathematical Education: ICME-13},
	url = {https://library.oapen.org/bitstream/20.500.12657/27742/1/1002263.pdf||https://library.oapen.org/bitstream/20.500.12657/27742/1/1002263.pdf||https://library.oapen.org/bitstream/20.500.12657/27742/1/1002263.pdf}
}