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D. Dichev
Department of Machine and Precision Engineering, Faculty of Machine and Precision Engineering, Technical University of Gabrovo, 4 Hadji Dimitar Street, 5300 Gabrovo, Bulgaria
H. Koev
Department of Machine and Precision Engineering, Faculty of Machine and Precision Engineering, Technical University of Gabrovo, 4 Hadji Dimitar Street, 5300 Gabrovo, Bulgaria
T. Bakalova
Institute for Nanomaterials, Advanced Technologies and Innovation, Technical University of Liberec, Studentska st. 2, 461 17 Liberec, Czech Republic
P. Louda
Department of Material Science, Technical University of Liberec, 2 Studentska Street, 46117 Liberec, Czech Republic