TY - JOUR AU - A.G. O'Farrell AU - K.J. Preskenis TI - Uniform approximation by polynomials in two functions. JO - Mathematische Annalen PY - 1989 SP - 529 EP - 536 VL - 284 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MAN_1989__284_4_164570/ ID - MAN_1989__284_4_164570 ER -