@inproceedings{berglund-etal-2017-single,
    title = "Single-Rooted {DAG}s in Regular {DAG} Languages: {P}arikh Image and Path Languages",
    author = {Berglund, Martin  and
      Bj{\"o}rklund, Henrik  and
      Drewes, Frank},
    editor = "Kuhlmann, Marco  and
      Scheffler, Tatjana",
    booktitle = "Proceedings of the 13th International Workshop on Tree Adjoining Grammars and Related Formalisms",
    month = sep,
    year = "2017",
    address = "Ume{\r{a}}, Sweden",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/ingest-emnlp/W17-6210/",
    pages = "94--101"
}