(3GHf GdQhei (B: s (3MjGJg hTYQg (B/ s - (3ceGd GHheUdMs; (3GHQGgje YHOGdbGOQ GdeGRfis ((3HjQhJ (B: s (3GdecJHI GdMOjKI ddWHGYI hGdfTQ , s, 1987)
Keywords: (3GHf GdQheis; (3GdGfHGAs