At the conference website for "The Measurement and Analysis of Innovation and Productivity Growth" 10-11 November 2005, Groningen GGDC Dseries
you'll find my paper:
Ian Miles “Services and R&D: Measurement and More”
http://www.ggdc.net/conf/wp9_conference/miles.pdf
Powerpoints for this are also available at http://www.ggdc.net/conf/wp9_conference/miles.ppt