(3GdQbGHI Ydi GdGOGA ef GdfGMjI GdYdejI h GdYedjI (B/ s - (3GdSjO YHOg fGLis ((3GdbGgQI (B: s (3OGQ GdfgVI GdYQHjI , s, 1991)
Keywords: (3GOGQI GdGYeGds; (3GdQbGHI GdGOGQjIs; (3GdGOGQI GdYdejIs