Heikkilä, Rauno; Jaakkola, Mika (2003), "Intelligent Road Construction Site - Development of Automation into total Working Process of Finnish Road Construction" (PDF), 2003 Proceedings of the 20th ISARC, Eindhoven, Holland, retrieved November 8, 2010 http://www.iaarc.org/publications/fulltext/isarc2003-61.pdf