(Wright, 1980, 1987). , , . 1960- (Muthard) (Salomone) (Bolton & Jaques, 1978). , , , , - (Muthard & Salomone, 1978). , 33% , 25% 7% .
1970 ; (Schumacher, 1983).
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(Cook, Bolton, Bellini & Neath, 1997, p. 193). , (Hershenson, 1992a) . , : , , . , ( ), ( ), ( ). , .
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. 6 . . CORE CRCC CREP NBCC. , , -, , , .