Android-ViewPagerIndicator - Paging indicator widgets compatible with the ViewPager from the Android Support Library and ActionBarSherlock. Originally based on Patrik Åkerfeldt's ViewFlow.
A. Girardello, and F. Michahelles. Proceedings of the 12th international conference on Human computer interaction with mobile devices and services, page 431--434. New York, NY, USA, ACM, (2010)