@article{IM2_1995_44_1_a7,
     author = {A. Khatamov},
     title = {Polynomial and rational approximation of functions of several variables with convex},
     journal = {Izvestiya. Mathematics},
     pages = {165--179},
     year = {1995},
     volume = {44},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1995_44_1_a7/}
}