(3fXe GdLeGf dJQJjH eGSda ef GNHGQ GdReGf (B/ s - (3eMehO Ydi ecis; (3GHf GdbWGf GdeQGcTi, GHh eMeOs ((3HjQhJ (B: s (3OGQ GdZQH GdGSdGei , s, 1990)
Keywords: (3GdGOH GdYQHis; (3GdGfOdSs; (3JGQjN hfbOs