@article{RM_1995_50_2_a4,
     author = {A. Pinkus and B. Wajnryb},
     title = {A~problem of approximation using multivariate polynomials},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {319--340},
     publisher = {mathdoc},
     volume = {50},
     number = {2},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1995_50_2_a4/}
}