(3gehe GdHfGJ (B/s - (3GdMSjfj , Cjef s ((3GdbGgQI (B:s (3ecJHI GHf SjfG ddWHGYI h GdfTQ h GdJhRjY h GdJUOjQ ,s, 1990)
Keywords: (3GdeQCIs -- (3UMI hfXGaIs; (3GdCeQGV GdJfGSdjI GdCfKhjIs