(3ebGWY OjhGf GdQaV (B:s (3TYQ (B/s - (3GdZeGQj,eUWai eMeO s ((3GdLRGFQ (B;(3GdLRGFQ (B:s (3GdeDSSI GdhWfjI ddafhf GdeWHYjI(B;(3GdeDSSI GdhWfjI ddcJGH ,s, 1989)
Keywords: (3GdQaVs; (3OjhGfs; (3TYQ s; (3ebGWYs