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[1]
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[3]
FRIEDMAN C, 1971, THESIS PRINCETON U
[4]
Kato T., 1966, PERTURBATION THEORY, V132, P396
[6]
SIMON B, 1969, THESIS PRINCETON U
[7]
Trotter H. F., 1958, PAC J MATH, V8, P887
[8]
[No title captured]