1. Discipline of Descriptive Geometry and Engineering Graphics, Department of AET, Faculty of Mechanical Engineering, Technical University of Cluj-Napoca, Cluj-Napoca, Romania
2. Department of Biomedical Computer Systems, Institute of Informatics, Faculty of Computer Science and Materials Science, University of Silesia, Sosnowiec, Poland
3. Department of Inorganic Chemistry, Faculty of Chemistry, University of Sofia, Sofia, Bulgaria
4. University of Milan-Bicocca, Milan, Italy