@article{DAN_1972_207_2_a7,
     author = {A. L. Kalashnikov and S. N. Slugin},
     title = {The pointwise partial order of a {Sobolev} space and the positivity of an optimal solution},
     journal = {Doklady Akademii Nauk},
     pages = {281--283},
     publisher = {mathdoc},
     volume = {207},
     number = {2},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_207_2_a7/}
}