- Wolfram Research Inc.,
Mathematica Information Center,
> http://library.wolfram.com/infocenter/Articles/2097/
> Αναφορά στην εργασία [Ε-4] - Adept Scientific PLC,
MathCAD: Research and White Papers,
>http://www.adeptscience.co.uk/products/mathsim/mathcad/academic/Teaching/research_papers.html
> Αναφορά στην εργασία [Ε-8]