(3GdLjOh (B- (3GdehShYI GdQjGVjI GdejSQI (B( 13 )s - (3O(B. (3YHO GdaJGM(B. (3ESeGYjds ((3OGQ GdcJGH GdeUQjs (3GdbGgQIs, 1990)
Keywords: (3GdLjOhs; (3GdQjGVI (B)s