P. Murinová, M. Burda, and V. Pavliska. EUSFLAT/IWIFSGN (2), volume 642 of Advances in Intelligent Systems and Computing, page 604-610. Springer, (2017)
P. Murinová, M. Burda, and V. Pavliska. EUSFLAT/IWIFSGN (2), volume 642 of Advances in Intelligent Systems and Computing, page 592-603. Springer, (2017)