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https://dirkriehle.com/2014/12/03/vortrag-zu-open-source-geschaftsmodellen-auf-dem-10ten-ose-symposium-munchen-2015-01-23/
Vortrag zu Open-Source-Gesch√§ftsmodellen auf dem 10ten OSE Symposium, M√ľnchen, 2015-01-23