Dear Sir or Madam, Thank you for the interesting catalogue of hard MILP instances. I contributed https://git.zib.de/miplib2017/submissions/commit/c38db0fc57cc09d4621e1e94328bc1af6843f2b7 to the 2017 set of instances. In the meantime, the paper which contains the background of the importance of these problems was published in arXiv. Hence I kindly ask you to update this contribution by adding the following BibTex reference: @article{heinlein2017new, title={A new upper bound for subspace codes}, author={Heinlein, Daniel and Kurz, Sascha}, journal={arXiv preprint arXiv:1703.08712}, year={2017} } Thank you in advance. Yours faithfully Daniel Heinlein