, . (Alvarez, 1983; Alvarez et al., 1980, 1984*). 65 . 10 . , 2 3 . , , , , .
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, . . , , (Officer, Drake, 1983, 1985*). , . . (Bohor et al., 1984, 1987*) , , , . . , (Hallam, 1984*). . , , , , . , , (Hallam, 1987*). (. Kerr, 1988*).
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