(3jhejGJ ajde (B((3gOjI ef GdGOjH YHOGdaJGM GdLed(B) / s - (3gGTe GdfMGSs; (3GMeO cGed eQSis ((3GdbGgQI (B: s (3OGQ GdcJGH GdYQHi ddWHGYI hGdfTQ , s, 1967)
Keywords: (3GdSjfeG (B- (3GadGes