@article{DAN_1970_192_3_a1,
     author = {A. I. Vaindiner},
     title = {Approximation of continuous and differentiable functions of several variables by generalized polynomials 
},
     journal = {Doklady Akademii Nauk},
     pages = {483--486},
     publisher = {mathdoc},
     volume = {192},
     number = {3},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1970_192_3_a1/}
}