%0 Journal Article %A A. L. Vol'berg %T 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.; %J Algebra i analiz %D 1991 %P 216-222 %V 3 %N 3 %U http://geodesic.mathdoc.fr/item/AA_1991_3_3_a11/ %G ru %F AA_1991_3_3_a11