5GIBBONS M, LIMOGES C, NOWOTHY H,SCHWARTZMAN S, SCOTT P, TROW M. The New Production of Knowledge: The Dynamics of Sci- ence and Research in Contemporary Societies [M]. London: Sage Publications, 1994 : 18.
6Chew K K, Tomizuka M. Digital control of repetitive errors in disk drive systems[A]. Proceedings of American Control Conference[C]. 1989. 540-548.