. 2013 Sep 10;2013:138012. doi: 10.1155/2013/138012
Copyright © 2013 Daniele D'Agostino et al.
This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Figure 11.
Annual CB's revenue with 75% frequent users.