????? ??? ????? ???? ?? ????? ?? ????? ????? ??? ???? ????? ????? ?? ???? ???????? ?????? ????? ??????? ??????? ??????? ?????????? ?????? ???????? ???????? ????? ?????? ?????? ??????? ??????? ????????? ??????? ?? ?????? ??????? ??????? ??? ????? ????? ???? "????? ????? ??????" ?????? ????? ??"????? ????? ???????" ?"????? ???????? ???????" ?? ????????. ??? ??????? ?? ???? ????? ????? ????? ?????? ??? ???? ???? ?? 60 ????? ????? ?? ???????? ?????? ????? ????? ?????? ?? ??? ??? ???????? ?????? ??????. ????? ??? ??? ????????? ??????? ??? ??????? ????ɡ ???? ??? ???????? ??? ???????? ??? ?????? ??????? ??????? ??????? ???????? ????????.

?????????? ??? ???????: ????? ??????? ??????? ??? ????? ????????? (1989)? ????? ??? ??????? ?? ??????????? ?????? ????????? ??? ?????? ????? ??????? ? ???????? ??? ??? ????? ??????? ??? ???????? ??????? ??????ɡ ???????? ??? ??? ????? ???????? ??? ???????? ??????? ??????? (1992).

????? ???? ????? ??? ???? ??? ????? ????? ?????? ?? ????? ??? ???? ?? ???? ?? ????? ???? ??????? ???????? ????????? ?? ??? ??????? ????? 19 ????? 2001.