@article{SM_2007_198_1_a2,
     author = {S. I. Dudov},
     title = {Relations between several problems of estimating convex},
     journal = {Sbornik. Mathematics},
     pages = {39--53},
     year = {2007},
     volume = {198},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2007_198_1_a2/}
}