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BELYAEV IN, 1967, IZV VYSSHIKH UCH KKT, V10, P852
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NESTEROVA NN, 1961, SOVIET PHYS SOLID ST, V9, P15
[8]
NESTEROVA NN, 1967, FIZ TVERD TELA, V9, P21
[9]
PISAREV RV, 1966, FIZ TVERD TELA+, V8, P783
[10]
PISAREV RV, 1966, SOV PHYS-SOLID STATE, V8, P627