TY - JOUR AU - G.W. Stewart TI - On a Companion Operator for Analytic Functions. JO - Numerische Mathematik PY - 1971 SP - 26 EP - 43 VL - 18 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/NUMA_1971__18_132090/ ID - NUMA_1971__18_132090 ER -