(3ecffI GdEfJGL GdMjhGfj (B/ s - (3GdfYeI, eMeO LGSes ((3GdehUd (B:s (3eOjQjI OGQ GdcJH ddWHGYI h GdfTQ,s, 1990)
Keywords: (3GdMjhGfGJ GdRQGYjIs; (3GdCHbGQs; (3eRGQY GdMjhGfGJs