1. Professor, Power and Transport Machinery Engineering Institute, Aleksandras Stulginskis Univ., Student St., 15, P.O. Box LT-53361, Kaunas Academy, Lithuania (corresponding author).
2. Professor, Power and Transport Machinery Engineering Institute, Aleksandras Stulginskis Univ., Student St., 15, P.O. Box LT-53361, Kaunas Academy, Lithuania.
3. Associate Professor, Engineering Management Dept., General Jonas Žemaitis Military Academy of Lithuania, Šilo St., 5a, P.O. Box LT-10322, Vilnius, Lithuania.