%0 Journal Article %A A. A. Azamov %A A. Begaliev %T An Existence Theorem and an Approximate Solution Method for a Pfaff Equation with Continuous Coefficients %J Trudy Instituta matematiki i mehaniki %D 2021 %P 12-24 %V 27 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/TIMM_2021_27_3_a1/ %G ru %F TIMM_2021_27_3_a1