Is one head enough? Mention heads in coreference annotations compared with UD-style heads Anna Nedoluzhko author Michal Novák author Martin Popel author Zdeněk Žabokrtský author Daniel Zeman author 2021-12 text Proceedings of the Sixth International Conference on Dependency Linguistics (Depling, SyntaxFest 2021) Nicolas Mazziotta editor Simon Mille editor Association for Computational Linguistics Sofia, Bulgaria conference publication nedoluzhko-etal-2021-one https://aclanthology.org/2021.depling-1.10/ 2021-12 101 114