(3GdWdGb hGdJZjQ GdGLJeGYi ai GdeLJeY GdSYhOi (B( (3OQGSI ejOGfjI ai eOjfg LOI(B) / s - (3KQhJ eMeO eMeO TdHis ((3GdbGgQI (B: s (3GdecJH GdLGeYi GdMOjK , s, 1990)
Keywords: (3GdGSQIs; (3GdWdGbs; (3GdSYhOjIs; (3GdGLJeGYs; (3GdMbhb GdRhLjIs; (3GdQLYIs; (3GdNdY (B( (3GdWdGb (B)s