An Extensible Multilingual Open Source Lemmatizer Ahmet Aker author Johann Petrak author Firas Sabbah author 2017-09 text Proceedings of the International Conference Recent Advances in Natural Language Processing, RANLP 2017 Ruslan Mitkov editor Galia Angelova editor INCOMA Ltd. Varna, Bulgaria conference publication aker-etal-2017-extensible 10.26615/978-954-452-049-6_006 https://aclanthology.org/R17-1006/ 2017-09 40 45