Lezhnin&nbsp;N.V. Makarov&nbsp;A.V. Luchko&nbsp;S.N.      The effect of ultrasonic impact-frictional treatment on the surface roughness and hardening of 09Mn2Si constructional steel // Letters on Materials. 2019. Vol. 9.  No. 3. P. 310-315. https://doi.org/10.22226/2410-3535-2019-3-310-315.<br> <img src='/images/wos.gif' width='86' height='16' align='absbottom' alt='WoS' title='Web of Science'>&nbsp; <img src='/images/scopus.gif' width='46' height='16' align='absbottom' alt='Scopus' title='Scopus'>&nbsp;<br><p><input type='button' value=' назад ' onclick='history.back(-1)'>