2Yu W, Kuber R, Murphy Eetal. A novel muhimodal inter- face for improving visually impaired people' s web accessi- bility [J].Virtual Reality, 2006 (9) : 133 - 148.
3J. A. M. van Deursen, J. A. G. M. van Dijk. Improving digi- tal skills for the use of online public information and servic- es[J]. Government information Quarterly.2009(2) :333-340.
