(3GdcQI GdWGFQI (B- (3GdehShYI GdQjGVjI GdejSQI (B( 3 )s - (3YHO GdaJGM(B. (3ESeGYjds ((3OGQ GdcJGH GddHfGfjs (3HjQhJs, 1990)
Keywords: (3GdQjGVIs; (3cQI GdWGFQIs