(3aQM GfWhf (B: s (3UYhO GdNWGH GdYdeGfi (B/ s - (3SejQ GHhMeOGfs ((3HjQhJ (B: s (3GdTQcI GdYGdejI ddcJGH T e d , s, 1992)
Keywords: (3JGQjNs; (3GdUMGaIs; (3GdUMajhf GdYQHs; (3aQM GfWhGfs