(3QSGdI Edi YdGA aj GdKbGaI (B/ s - (3GdYQehWj, ESeGYjds ((3YeGf (B:s (3GdeDda,s, 1989)
Keywords: (3GdQSGFd GdYQHjIs; (3GdCQOfs; (3GdCOH GdYQHjs