1. Department of AET, Technical University of Cluj-Napoca, Faculty of Mechanical Engineering, Discipline of Descriptive Geometry and Engineering Graphics; 103-105 B-dul Muncii St. Cluj-Napoca 400641 Cluj Romania
2. Department of Biomedical Computer Systems; University of Silesia, Faculty of Computer Science and Materials Science, Institute of Informatics; ul. Będzińska 39, 41-205 Sosnowiec Poland