Hodych, O.V. Providing Feedback in Ukrainian Sign Language Tutoring Software Rough Sets and Intelligent Systems / M.V. Davydov, I.V. Nikolski, V.V. Pasichnyk, O.V. Hodych, Y.M. Scherbyna // Іn Springer Berlin Heidelberg: Rough Sets and Intelligent Systems - Professor Zdzislaw Pawlak in Memoriam. Intelligent Systems Reference Library. – A. Skowron, Z. Suraj eds. – Vol. 43. – v. 2. – Berlin, 2013. – SNIP 0,216.– P. 241-261. (каф. НДР) http://link.springer.com/chapter/10.1007%2F978-3-642-30341-8_13#page-2