@article{DAN_1993_330_6_a1,
     author = {V. I. Burenkov and A. L. Gorbunov},
     title = {A two-sided estimate for the minimal norm of the extension},
     journal = {Doklady Akademii Nauk},
     pages = {680--682},
     year = {1993},
     volume = {330},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_330_6_a1/}
}