1. Besl PJ, McKay ND (1992) A method for registration of 3-D shapes. IEEE Trans Pattern Anal Mach Intell 14(2):239– 256
2. Bofinger JM (2001) Analyse und Implementierung eines Verfahrens zur Referenzierung geographischer Objekte. http://www.ifp.uni-stuttgart.de/lehre/diplomarbeiten/Bofinger/Diplomarbeit . Online; Diplomarbeit, German
3. Comtet L (1974) Advanced Combinatorics, chap. 1, p. 75. Reidel, Dordrecht. Problem 9
4. mobile.info Consortium (2007) mobile.info Final Project Report. http://www.mobile-info.org/prom/mobileinfo.nsf/DocID/D6D289BDF68A0584C125739B00547F9E/(file/Mobile_Info_Schlussbericht.pdf . [Online; accessed 26-November-2014]
5. Creative Commons (CC). creative commons Attribution-NoDerivs 3.0 Unported. http://creativecommons.org/licenses/by-nd/3.0/legalcode . Online; accessed 26-November-2014