%0 Journal Article %A M. I. Sumin %T Regularization of the Pontryagin maximum principle in a convex optimal boundary control problem for a parabolic equation with an operator equality constraint %J Trudy Instituta matematiki i mehaniki %D 2021 %P 221-237 %V 27 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TIMM_2021_27_2_a18/ %G ru %F TIMM_2021_27_2_a18