@article{Kovalev2015acoustic,
author={Kovalev, I.. and Lankin, A.. and Baklanov, A.. and Kazaryan, A..},
title={ACOUSTIC ULTRASONIC HARDNESS TESTER},
journal={Alternative energy sources in the transport-technological complex: problems and prospects of rational use of},
publisher={FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov},
year={2015},
pages={436-439},
volume={2},
issue={2},
}