@article{learningmsodefinablehypothesesonstring,
  title = {Learning MSO-definable hypotheses on string},
  author = {Martin Grohe and Christof Löding and Martin Ritzert},
  year = {2017},
  eprint = {1708.08081},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1708.08081v1},
}