1] mr Marko Orošnjak Significance of hydraulic system working fluid maintenance with integrated logic and built-in components" - 13th International Conference on Accomplishments in Mechanical and Industrial Engineering, 01.02.2017.
(https://ekonferencije.com/sr1/rad/significance-of-hydraulic-syst/4778)

2] mr Marko Orošnjak Lubricating oils for automotive natural gas engines" - 13th International Conference on Accomplishments in Mechanical and Industrial Engineering, 25.01.2017.
(https://ekonferencije.com/sr1/rad/lubricating-oils-for-automotiv/4763)