CALL-technolgy based approach to control acquisition of foreign language skillsNymm, Voldemar; Piotrowska, Xenia; Nõmm, Sven; Ronzhin, AndreyProceedings of the III International Conference on Language Engineering and Applied Linguistics (PRLEAL-2019), Saint Petersburg, Russia, November 27, 20192020 / art. 157532, p. 200-210 http://ceur-ws.org/Vol-2552/Paper16.pdf Conference proceedings at Scopus Article at Scopus