(3GdGbJUGO hGdHjFI (B:s ((3eONd HjFi(B) / s - (3GeHGHi(B, (3eMeO Ydi GdSjO(B.s ((3GdbGgQg (B:s (3GdecJHg GdGcGOjejg (B,s, 1998)
(3jMJhi Ydi bGFeI HHdjhLQGajg HGdeQGLY(B((3U (B199-206).s
1
Keywords: (3GdHjFg(B.s; (3JdhK GdHjFg(B.s; (3GdJdhKs -- (3GdLhGfH GdGbJUGOjg(B.s