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Ştefan Ţălu
Technical University of Cluj-Napoca, Faculty of Mechanical Engineering, Department of AET, Discipline of Descriptive Geometry and Engineering Graphics, 103-105 B-dul Muncii St.,Cluj-Napoca, Romania
Sebastian Stach
University of Silesia, Faculty of Computer Science and Materials Science, Institute of Informatics, Department of Biomedical Computer Systems, ul. B˛edzi´nska 39, 41-205Sosnowiec, Poland