(3cfhR GdhGOi (B(20 (3ObjbI(B) / s - (3YUGe GdHZOGOi (B((3GNQGL(B)s ([S.N] : (3GdeQcR Gdbhei ddSjfeG , s, 1986)
Keywords: (3TQGFW ajOjhs; (3GadGe JSLjdjIs