VILA: Improving Structured Content Extraction from Scientific PDFs Using Visual Layout Groups Zejiang Shen author Kyle Lo author Lucy Lu Wang author Bailey Kuehl author Daniel S Weld author Doug Downey author 2022 text journal article Transactions of the Association for Computational Linguistics continuing MIT Press Cambridge, MA periodical academic journal shen-etal-2022-vila 10.1162/tacl_a_00466 https://aclanthology.org/2022.tacl-1.22/ 2022 10 376 392