共 4 条
[1]
BERGMAN S, 1947, FONCTIONS ORTHOGONAL, P24
[2]
HALMOS PR, 1951, INTRO HILBERT SPACE, P50
[3]
HILLE E, 1948, FUNCTIONAL ANAL SEMI, P123
[4]
WINTNER A, 1952, AM J MATH, V74, P360