1. Open Laboratory on Experimental Micro and Nano Mechanics Institute of Mechanics Bulgarian Academy of Sciences Acad. G. Bonchev Str., Block 4, 1113 Sofia Bulgaria
2. Research and Development of Nanomaterials and Nanotechnologies, Ltd. (NanoTechLab) Acad. G. Bonchev Str., Block 4, 1113 Sofia Bulgaria
3. Department of Industrial Engineering University of Salerno Via Giovanni Paolo II Fisciano SA 84084 Italy