????????? ???????? ?????????? ??????? ??? ??????? ????ɡ ???? ??????? ???????? ???????? ?????? ??????? ???????? ???????. ?? ????? 1981????? ??? ????? ????? ???? ???????? ??? ???? ??????? ?????? ?????? ????? ????? ????? ??????????. ?? ?????? 1995? ???? ???? ???? ????? ???????? ?????? ???? ??????? ?? ??????.

?????????? ??? ???????: ????? ??????? ??????? ??? ???????? (1981)? ???????? ??? ??????? ????? ???????? ??? ?????? ????? ?? ??????? (1992)? ???????? ???????? ??????? ???????? ??????? ??? ?????? ??????? ?? 1997-1999(1997)? ????? ????????? ??????? ????? ??? ??????? (1997).

??????? ??????? ??? ???? ????????? ?????? ????????? ??? ???? ??????:???? ????? ???? ??????? ??????? ??????? ?? ???? ???? ??????? ??????? ????? ?? ???? ?????? ? ????? ???? ??? ???? ????????? ?????? ????????? ??? ???? ?????? ????? ??????? ?? 15 ????? 2001? ???? ?????? "?????? ????????" ???????. ???? ????? ???? ????? ???? ??? ????? ??? ???? ?? ???? ??????? ????? ???? ????? ????????? ????? ??? ???? ????? ????? ??????? ?????? ?????? ?? ??????? ??????? ???????.