NUMERICAL RANGE OF NORMAL OPERATOR

[1] Ando T., 1963, P AM MATH SOC, V14, P290

[2] BERBERIAN SK, 1962, J LOND MATH SOC, V37, P403

[3] BOURBAKI N, 1953, ELEMENTS MATHEMATIQU, P1189

[4] SIMMONS GF, 1963, INTRODUCTION TOPOLOG

[5] Stone M. H., 1932, LINEAR TRANSFORMATIO, V15

[6] ZASSENHAUS H, 1961, J MATH MECH, V10, P179

[7] [No title captured]

[8] [No title captured]

[1] Ando T., 1963, P AM MATH SOC, V14, P290

[2] BERBERIAN SK, 1962, J LOND MATH SOC, V37, P403

[3] BOURBAKI N, 1953, ELEMENTS MATHEMATIQU, P1189

[4] SIMMONS GF, 1963, INTRODUCTION TOPOLOG

[5] Stone M. H., 1932, LINEAR TRANSFORMATIO, V15

[6] ZASSENHAUS H, 1961, J MATH MECH, V10, P179

[7] [No title captured]

[8] [No title captured]