From Characters to Time Intervals: New Paradigms for Evaluation and Neural Parsing of Time Normalizations Egoitz Laparra author Dongfang Xu author Steven Bethard author 2018 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal laparra-etal-2018-characters 10.1162/tacl_a_00025 https://aclanthology.org/Q18-1025/ 2018 6 343 356