Alter S, Gal U, Lipien D, Lyytinen K, Russo N. Information Systems and the Service Economy: A Multidimensional Perspective [Internet]. Information Technology in the Service Economy: Challenges and Possibilities for the 21st Century. 2008. pp. 349 - 352. http://dx.doi.org/10.1007/978-0-387-09768-8_26