Measuring the Evolution of a Scientific Field through Citation Frames David Jurgens author Srijan Kumar author Raine Hoover author Dan McFarland author Dan Jurafsky author 2018 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal jurgens-etal-2018-measuring 10.1162/tacl_a_00028 https://aclanthology.org/Q18-1028/ 2018 6 391 406