%0 Journal Article %T MATHEMATICAL MODELING IN THE STUDY OF ROUGHNESS AS APPLIED TO INTERNAL SURFACES %A Batmanov, E.. %A Bulgakov, V.. %A Guseinov, R.. %K roughness, mathematical model, inner surface, tap, design of experiments, geometric parameters %J Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies %D 2019 %N 2019 %P 6 %I Astrakhan State Technical University