Germonprez M, Hovorka D. The Information Services View [Internet]. Information Technology in the Service Economy: Challenges and Possibilities for the 21st Century. 2008. pp. 365 - 366. http://dx.doi.org/10.1007/978-0-387-09768-8_29
Braley D, Fano A, Lassila O, Light J, Germonprez M. Ubiquitous Computing in Practice. Designing Ubiquitous Information Environments: Socio-Technical Issues and Challenges. 2005. pp. 365 - 367.