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Progress of Theoretical Physics Vol. 40 No. 5 (1968) pp. 942-957 A Solution of a Dyson Equation in Many-Impurity Problems in Solids Shozo Takeno Progress of Theoretical Physics Supplement No.53 (1973) pp. 1-76 Coherent Potential Approximation Fumiko Yonezawa and Kazuo Morigaki
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Fumiko Yonezawa (1968) studied this question.
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