%0 Journal Article %A A. L. Kalashnikov %A S. N. Slugin %T The pointwise partial order of a Sobolev space and the positivity of an optimal solution %J Doklady Akademii Nauk %D 1972 %P 281-283 %V 207 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1972_207_2_a7/ %G ru %F DAN_1972_207_2_a7