Kazakov&nbsp;A.L. Spevak&nbsp;L.F.       Exact and approximate solutions of a problem with a singularity for a convection–diffusion equation // Journal of Applied Mechanics and Technical Physics. 2021. Vol. 62.  No. 1. P. 18-26. DOI: 10.1134/S002189442101003X.<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)'>