Stacy Avery Baird. The heterogeneous world of proprietary and open-source software. In Tomasz Janowski, Theresa A. Pardo, editors, Proceedings of the 2nd International Conference on Theory and Practice of Electronic Governance, ICEGOV 2008, Cairo, Egypt, December 1-4, 2008. Volume 351 of ACM International Conference Proceeding Series, pages 232-238, ACM, 2008. [doi]