On rings of operators

[1] [Anonymous], 1981, PRINCIPLES QUANTUM M

[2] Birkhoff G, 1933, P CAMB PHILOS SOC, V29, P441

[3] Bochner S., 1933, FUND MATH, V20, P262

[4] BURNSIDE W, 1905, P LOND MATH SOC, V3, P430

[5] CARATHEODORY C, 1918, REELE FUNKTIONEN

[6] CARATHEODORY C, 1927, REELE FUNKTIONEN

[7] COURANT R, 1931, METHODEN MATH PHYS

[8] Spectral theory of semi-bound operators and use of the spectral analysis of differential operators. [J]. MATHEMATISCHE ANNALEN, 1934, 109 : 465 - 487

[9] FROBENIUS G, 1906, AQUIVALENZ GRUPPEN L, P209

[10] Klein Fritz, 1931, MATH ANN, V105, P308

[1] [Anonymous], 1981, PRINCIPLES QUANTUM M

[2] Birkhoff G, 1933, P CAMB PHILOS SOC, V29, P441

[3] Bochner S., 1933, FUND MATH, V20, P262

[4] BURNSIDE W, 1905, P LOND MATH SOC, V3, P430

[5] CARATHEODORY C, 1918, REELE FUNKTIONEN

[6] CARATHEODORY C, 1927, REELE FUNKTIONEN

[7] COURANT R, 1931, METHODEN MATH PHYS

[8] Spectral theory of semi-bound operators and use of the spectral analysis of differential operators. [J]. MATHEMATISCHE ANNALEN, 1934, 109 : 465 - 487

[9] FROBENIUS G, 1906, AQUIVALENZ GRUPPEN L, P209

[10] Klein Fritz, 1931, MATH ANN, V105, P308