(3bGfhf GdJChjd (B/ s - (3EHf GdYQHj, CHh HcQ eMeO Hf YHOGddg, s - (3GdeJhaj (B543(3, s; (3GdSdjeGfj, eMeOs ((3HjQhJ (B: s (3OGQ GdZQH GdGSdGej, s, 1990)
Keywords: (3GdYdhe GdbQBfjI(B. s; (3GdbQBf GdcQje(B. s; (3JaSjQ GdbQBf(B. s