(3EOGQI GdEfJGL h GdYedjGJ (B: s (3eONd cej (B/ s - (3GdHcQj, ShfjG eMeOs ((3GdEScfOQjI (B:s (3GdOGQ GdLGeYjI ddWHGYI hGdfTQ hGdJhRjY,s, 1994)
Keywords: (3GdEOGQIs; (3JbfjGJ GdEOGQIs; (3EOGQI GdEfJGLs