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168. .

. . [42] , , , .

. . [5] , .

. . [1] , .

: [1], (Chattarji [1]), (Dinca, Boicu [2]), Dumitrescu, Stanescu [1]) .

, . (Almansi [4]) (Michell [4]) , ,

z ( z ). , z, (Almansi [4]) . . [1, 2].

. . [1 - 6] , ; .

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