1. Faculty of Special Technology, Alexander Dubček University of Trenčín, Pri parku 19, 911 06 Trenčín-Záblatie, Slovakia
2. Mechanical Engineering Department, Armed Forces Academy of General Milan Rastislav Štefánik, Demänová 393, 031 01 Liptovský Mikuláš, Slovakia
3. Slovak Centre of Scientific and Technical Information, Lamačská cesta 8/A, 811 04 Bratislava, Slovakia