http://www.netlib.org/linalg/old_html_templates/chapter2.6.html

http://www.sam.math.ethz.ch/~mhg

http://www.cs.utk.edu/~dongarra/etemplates/node390.html

http://www.mcc.uiuc.edu/SummerSchool/Eric%20de%20Sturler/desturler.htm

http://www.psc.edu/~burkardt/papers/linear_glossary.html

software to download