@article{DAN_1987_294_6_a1,
     author = {V. I. Burenkov and V. A. Gusakov},
     title = {On exact constants in {Sobolev} embedding theorems},
     journal = {Doklady Akademii Nauk},
     pages = {1293--1297},
     publisher = {mathdoc},
     volume = {294},
     number = {6},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_294_6_a1/}
}