J4 ›› 2010, Vol. 45 ›› Issue (2): 50-53.
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Key words: generalized perturbation; Bessel sequence; Hilbert space
LIU Qin, CAO Huai-Xin, WANG Qiu-Fen. Generalized perturbations of Bessel sequences in a Hilbert space[J].J4, 2010, 45(2): 50-53.
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