TY - JOUR AU - A. Pinkus TI - Bernstein's comparison theorem and a problem of Braess. JO - Aequationes mathematicae PY - 1981 SP - 98 EP - 107 VL - 23 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AM2_1981__23_136894/ ID - AM2_1981__23_136894 ER -