(3GdCSdMI GdcjeGhjI hGdLQKhejI (B/s - (3UHMj, fHjds ((3HjQhJ (B:s (3eDSSI GdQSGdI,s, 1990)
(3HHdjhLQGajI (B: (3U(B. 183-190.s
Keywords: (3GdCSdMI GdcjejGFjIs; (3GdCSdMI GdHjhdhLjIs