@book{15199,
	author = {Keßler, Jörg-U.||Lenzing, Anke||Liebner, Mathias},
	title = {Developing, Modelling and Assessing Second Languages},
	url = {https://library.oapen.org/bitstream/20.500.12657/25985/1/1004096.pdf||https://library.oapen.org/bitstream/20.500.12657/25985/1/1004096.pdf||https://library.oapen.org/bitstream/20.500.12657/25985/1/1004096.pdf}
}