Here are some useful links:

南京大学:http://www.nju.edu.cn/

南京大学数学系:http://math.nju.edu.cn

超星数字图书馆: 南京大学镜像

The Comprehensive TeX Archive Network: CTAN-Web

中文TeX套装: http://www.ctex.org/

Math Review: http://www.ams.org/mathscinet

e-print archive: http://arxiv.org/ and it's Chinese mirror: http://cn.arxiv.org/

American Journal of Mathematics: http://muse.jhu.edu/journals/american_journal_of_mathematics

Commentarii mathematici Helvetici(1929-1996): http://www.sub.uni-goettingen.de/gdz

Geometric and functional analysis(1991-1996): http://www.sub.uni-goettingen.de/gdz

Inventiones mathematicae(1966-1996): http://www.sub.uni-goettingen.de/gdz

Journal of Differential Geometry: JDG Online

Mathematische Annalen(1869-1996): http://www.sub.uni-goettingen.de/gdz

Manuscripta mathematica(1969-1994): http://www.sub.uni-goettingen.de/gdz

Mathematische Zeitschrift(1918-1996): http://www.sub.uni-goettingen.de/gdz

Publications IHES(1959-1997): http://www.numdam.org/

Pacific Journal of Mathematics: http://www.math.uci.edu/pjm.html