The 9th international OpenAIRE workshop on Sustainable non-APC open access (OA) publishing models took place on February 26-27, 2019 at the University of Bielefeld, Germany. It showcased a range of successful non-APC OA publishing models. A particular focus was on consortia models, assessing their relative strengths and weaknesses, conducting cross-disciplinary analyses of their efficacy in different academic contexts and discussing cost sharing and joint sustainability strategies. 47 scholarly ...