(3GdGcdGJ hGdGZPjI GdTYHjI aj GdNdjL(B:s (3WQb JMXjQgG (B_ (3bjeJgG GdZPGFjI(B_ (3ahGFOgG GdUMjIs - (3eUjbQ, YHO GdQMef YHjOs ((3GdchjJ(B:s (3PGJ GdSdGSd ddWHGYI hGdfTQ hGdJhRjY GdchjJs, 1990)