Francis Bordeleau, Alberto Sillitti, Paulo Meirelles, Valentina Lenarduzzi: Open Source Systems - 15th IFIP WG 2.13 International Conference, OSS 2019, Montreal, QC, Canada, May 26-27, 2019, Proceedings. IFIP Advances in Information and Communication Technology 556, Springer 2019, ISBN 978-3-030-20882-0