(3OQGSGJ ai JGQjN NQGSGf ai GdYUQ GdGehi ef (B40 132(3g` (B/ s - (3QGVi YHOGddg YHOGdMdjes ([S.N] : (3OGQ GdGfOdS ddGYdGe , s, 1987)
Keywords: (3GdJGQjN GdGSdGeis; (3NQGSGfs