(3Yjf OGhhO(B: (3YedjGJ GdhMOGJ GdSQjI GdGSQGFjdjI (B/ s - (3ahdGJ,GjQjTs; (3GSjeI LGfhs ((3GdbGgQI (B: s (3ecJHI eOHhdi , s, 1987)
Keywords: (3GdLGShSjIs; (3GdehSGOs; (3GdUQGY GdYQHi GdGSQGFjdis