(3GdefgL GdEjeGfj ddOQGSGJ GdchfjI aj GdbQBf GdcQje (B/s - (3NVQ, YHO GdYdje YHO GdQMefs ((3LOI (B:s (3GdOGQ GdSYhOjI ddfTQ hGdJhRjY ,s, 1987)
(3Rcj(B.s
Keywords: (3GdbQBf hGdYdes; (3GdbQBf hGdchfs