(3eYPHh GdCQV (B/s - (3aGfhf,aQGfR s; (3Thdjs ((3GdLRGFQ (B:s (3ehae ddfTQh GdJhRjY (B;(3GdeDSSI GdhWfjI ddafhf GdeWHYjI ,s, 1990)
Keywords: (3Thdjs; (3aGfhf aQGfRs