@article{MAN_1989__284_4_164570,
     author = {A.G. O'Farrell and K.J. Preskenis},
     title = {Uniform approximation by polynomials in two functions.},
     journal = {Mathematische Annalen},
     pages = {529--536},
     publisher = {mathdoc},
     volume = {284},
     number = {4},
     year = {1989},
     url = {http://geodesic.mathdoc.fr/item/MAN_1989__284_4_164570/}
}