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VASYL STEFANYK
PRECARPATHIAN NATIONAL UNIVERSITY

Department of computer science,

faculty of mathematics and computer science

Vasyl Stefanyk Precarpathian National University

Taras Shevchenko str., 57, 

Ivano-Frankivsk, Ukraine,

76018

Tel.: +38 (0342) 59-60-86,

e-mail: vitaliy.goryelov()pnu.edu.ua