C. Tsiaras, M. Waldburger, G. S. Machado, A. Vancea, B. Stiller: The Design of a Single Funding Point Charging Architecture; 18th EUNICE Conference on Information and Communications Technologies, "Information and Communication Technologies", Budapest, Hungary, August 2012, ISSN 0302-9743, pp 148-160. doi:10.1007/978-3-642-32808-4_14 URL: https://files.ifi.uzh.ch/CSG/staff/tsiaras/Extern/Publications/The_Design_of_a_Single_Funding_Point_Charging_Architecture_EUNICE_2012.pdf.