1. http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=51206
2. Representing geometriv structares in d dimensions: topology and order;Brison E,1989
3. Representing geometriv structares in d dimensions: topology and order;Oosterom P,2002
4. http://www.amazon.com/Foundations-Multidimensional-Structures-Kaufmann-Computer/dp/0123694469
5. http://www.springer.com/computer/information+systems+and+applications/book/978-1-84628-312-3