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M. Kumermanis
Riga Technical University, Institute of Mechanical Engineering, 6 Ezermalas Str., Riga, LATVIA
J. Rudzitis
Riga Technical University, Institute of Mechanical Engineering, 6 Ezermalas Str., Riga, LATVIA
N. Mozga
Riga Technical University, Institute of Mechanical Engineering, 6 Ezermalas Str., Riga, LATVIA
A. Ancans
Riga Technical University, Institute of Mechanical Engineering, 6 Ezermalas Str., Riga, LATVIA
A. Grislis
Riga Technical University, Institute of Mechanical Engineering, 6 Ezermalas Str., Riga, LATVIA