TY - JOUR AU - A. L. Vol'berg TI - J.~William Helton. ``Operator Theory, Analytic Functions, Matrices, and Electrical Engineering''. CBMS Regional Conf. Series in Math.~N~68. American Math. Society, 1987. 134~p.; JO - Algebra i analiz PY - 1991 SP - 216 EP - 222 VL - 3 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/AA_1991_3_3_a11/ LA - ru ID - AA_1991_3_3_a11 ER -