(3bVGA GdeTQhYjI(B: (3hadSaI GdGfaJGM GdeUQi (B((3OQGSI ebGQfI(B) / s - (3YHOGdefYe eMahXs ([S.N] : (3dG jhLO , s, 1990)
Keywords: (3GdbGfhf GdGOGQis; (3GdbVGA GdGOGQjs; (3GdYbhO GdGOGQjIs