(3GdSMQ (B: s (3MbjbJg (B, (3CfhGYg (B, (3GdhbGjI efg (B/ s - (3GdCSeQ, QGLjs ((3WQGHdS (B((3dHfGf(B) : s (3LQhS HQS, s, 1991)
Keywords: (3GdbQBf GdcQje(B. s; (3GdSMQ(B. s