Algorithms for extracting lines, paragraphs with their properties in PDF documentsViacheslav Martsinkevich, Andrei Berezhkov, Vladislav Tereshchenko, Natalia Gorlushkina and Violetta TretjakovaE3S Web of Conf., 389 (2023) 08024DOI: https://doi.org/10.1051/e3sconf/202338908024