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... [ JETP Lett . 39,78 ( 1984 ) ] . 14E . L. Ivchenko and G. E. Pikus , in : Problems in Modern Physics [ in Russian ] , Leningrd ( 1980 ) , p . 275 . 15y . I. Belinicher and B. I. Sturman , Usp . Fiz . Nauk 130 , 415 ( 1980 ) [ Sov . Phys ...