Tony Wasserman

Wiggins, Andrea, et al. “Heartbeat: Measuring Active User Base and Potential User Interest in FLOSS Projects”. Proceedings of The Fifth International Conference on Open Source Systems (OSS), vol. 299, Springer Boston, 2009, pp. 94-104, doi:10.1007/978-3-642-02032-2%5f10.

Scialdone, Michael J., et al. “Group Maintenance Behaviours of Core and Peripheral Members of Free Libre Open Source Software Teams”. Proceedings of The Fifth International Conference on Open Source Systems (OSS), 2009.