http://renatocappellani.altervista.org/blog/consultazione-gratuita-libri-manuali-matematica/?doing_wp_cron=1417251348.7575240135192871093750
http://eqworld.ipmnet.ru/en/info/books.htm
http://dlmf.nist.gov/
http://people.math.gatech.edu/~cain/textbooks/onlinebooks.html
http://www.x3dom.org/
http://examples.x3dom.org/example/SplinePositionInterpolator.xhtml
http://dlmf.nist.gov/software/
