1. 2013-04-15 Research Study: Open source developers on the fence b solr-dev Thomas Zerbach 2. 2013-04-15 Research Study: Open source developers on the fence b lucene-de Thomas Zerbach 3. 2013-03-29 Re: [kde] Research Study: Open Source Developers on t kde dE . 4. 2013-03-27 [kde] Research Study: Open Source Developers on the f kde Thomas Zerbach