6Black, S. Impact of full text on print journal use. Library Resources and Technical Services. 2005 (49) : 19 - 26
7Brown, C.M. Information seeking behavior of scientists in the electronic information age : Astronomers, chemists, mathematicians, and physicists. Journal of the American Society for Information Science. 1999 (50) :929 -943.
8Davis, P.M. Information seeking behavior of chemists: A transaction log analysis of referral URLs. Journal of the American Society for Informarion Science. 2004 (55) :326 - 332.
9Van Schyndel RG,Tirkel AZ,Osborne CF.A digital watermarking[].IEEE Proceedings on International Conference on Image Processing.1994
10Shafi Goldwasser,Silvio Micali,Ronald L Rivest.A digital signature scheme secure against adaptive chosen-message attacks. SIAM Journal on Computing . 1988
