(3bUjOI GdQKGA Hjf TYQGA GdGJLGg GdeMGaX heOQSI GdOjhGf (B: s (3OQGSI GSdhHjI GMUGFjI (B/ s - (3haGA cGed aGjOs ((3GdbGgQI (B: s (3GdgjFI GdeUQjI GdYGeI ddcJGH , s, 2000)
Keywords: (3GdGSdhH GdGOHis; (3TYQ GdQKGAs; (3GdTYQGA GdYQHs; (3GdTYQ GdYQHi (B- (3JGQjN hfbOs; (3TYQ GdQKGA (B- (3JGQjN hfbOs