(3bUQ GdThb (B((3HGdfQhjLjI(B) / s - (3fLjH eMahXs ([S.N] : (3GdLGeYI GdGeQjcjI HGdbGgQI , s, 1991)
Keywords: (3GdGOH GdYQHis; (3GdbUI GdYQHjIs; (3fLjH eMahXs