Espejo-Garcia, Borja Lopez-Pellicer, Francisco J. Lacasta, Javier Piedrafita Moreno, Ramón Zarazaga-Soria, F. Javier End-to-end sequence labeling via deep learning for automatic extraction of agricultural regulations Comput. electron. agric. 10.1016/j.compag.2019.03.027 2019 2019