????????? ?????????? ????????? ??? ????? ???????
???? ??????? ??????? ???????? ??? ??????? ??? ??? 1955. ??? ????? ???????? ??????????? ??? ???????? ?????? ????????? ?????????? ?????????? ??????? ???? ??????? ????????? ??????. ??? ???????? 230????? ????? ?? ??? 1998? ???? 3?110 ????? ????? ??????? ?????? ?85?119 ????? ????? ??????? ?????. ??? ????? ???? ????? ??????? ??????? ??????? ????? ??????? ?????.
???? ????? ??????? ?????????? ?????????? ????????? ???????: ????? ??????? (1980)? ????? ????? ?????? ????????? (1985)? ????? ??? ????? ???? ???????? ??????? ?????? (1986)? ????? ??? ???????? ??????? ?????? ??????? ????????? ??????????? (1989).
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