(3ef bJd gDdGA (B: s (3GdEZJjGd GdSjGSj GdeYGUQ (B/ s - (3SdGeg, eMeO QLHs ((3YeGf (B:s (3OGQ GdCSQGA ddfTQ hGdJhRjY,s, 1999)
Keywords: (3GdLQjeIs; (3GdEZJjGds; (3GdLQGFe GdSjGSjIs