[Druid] Non-recoverable Citation

Dear DRUID, I have cited a conference paper from your 2013 conference, but the URL no longer seems to work: Veer, T., Lorenz, A., & Blind, K. (2013, June 17-19). How Open is too Open? The 'Dark Side' of Openness along the Innovation Value Chain. 35th DRUID Celebration Conference, 31. Retrieved from https://conference.druid.dk/acc_papers/lmmgllbcx6ysd6m6kpjqiok4x49k.pdf Please may I find out if this is retrievable elsewhere? Thank you, Michael Winn Swansea University, UK