6HANSSON H,van de BUNT-KOKHUIS S.E-learning and language change-Observations[J].tendencies and reflections,2004(1):2333-2336.
7SARASWADY D,PRITHIV S V,SHANMUGAVEL S.Comparison of integrated micro and macro mobility protocols[J].Lecture Notes in Computer Science,2004,3285:214-221.