RADIUS OF ESSENTIAL SPECTRUM

[1] ON THE SPECTRAL THEORY OF ELLIPTIC DIFFERENTIAL OPERATORS .1. [J]. MATHEMATISCHE ANNALEN, 1961, 142 (01) : 22 - 130

[2] Darbo G., 1955, REND SEM MATH U PADO, V24, P84

[3] Gohberg I., 1957, AM MATH SOC TRANSL, V12, P43

[4] Gol'denstein L S., 1957, UCH ZAP KISHINEV GOS, V29, P29

[5] Gol'denstein L S., 1965, STUDIES ALGEBRA MATH, P45

[6] GOLDENSTEIN LS, 1968, MR, V35, P789

[7] Kato T., 1966, PERTURBATION THEORY, V132, P396

[8] Kuratowski K., 1930, FUND MATH, V15, P301

[9] Nussbaum R. D., 1969, THESIS U CHICAGO

[10] FIXED POINT INDEX AND ASYMPTOTIC FIXED POINT THEOREMS FOR K-SET-CONTRACTIONS [J]. BULLETIN OF THE AMERICAN MATHEMATICAL SOCIETY, 1969, 75 (03) : 490 - &

[1] ON THE SPECTRAL THEORY OF ELLIPTIC DIFFERENTIAL OPERATORS .1. [J]. MATHEMATISCHE ANNALEN, 1961, 142 (01) : 22 - 130

[2] Darbo G., 1955, REND SEM MATH U PADO, V24, P84

[3] Gohberg I., 1957, AM MATH SOC TRANSL, V12, P43

[4] Gol'denstein L S., 1957, UCH ZAP KISHINEV GOS, V29, P29

[5] Gol'denstein L S., 1965, STUDIES ALGEBRA MATH, P45

[6] GOLDENSTEIN LS, 1968, MR, V35, P789

[7] Kato T., 1966, PERTURBATION THEORY, V132, P396

[8] Kuratowski K., 1930, FUND MATH, V15, P301

[9] Nussbaum R. D., 1969, THESIS U CHICAGO

[10] FIXED POINT INDEX AND ASYMPTOTIC FIXED POINT THEOREMS FOR K-SET-CONTRACTIONS [J]. BULLETIN OF THE AMERICAN MATHEMATICAL SOCIETY, 1969, 75 (03) : 490 - &