TY - JOUR AU - Peller, V. TI - Factorization and approximation problems for matrix functions JO - Journal of the American Mathematical Society PY - 1998 SP - 751 EP - 770 VL - 11 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-98-00274-4/ DO - 10.1090/S0894-0347-98-00274-4 ID - 10_1090_S0894_0347_98_00274_4 ER -