(3CSQGQ Ndb GdEfSGf (B:s (3GdYLGFH aj GdUdH hGdJQGFH (B/s - (3GdSYOj, OGhO SdeGfs ((3HjQhJ (B:s (3OGQ GdMQa GdYQHj,s, 1999)
(3HHdjhLQGajI (B: (3UaMI (B215-218.s
Keywords: (3GdbQBfs -- (3EYLGRs; (3GdbQBf hGdEfSGfs