Multi-level analysis and recognition of the text sentiment on the example of consumer opinions Jan Kocoń author Monika Zaśko-Zielińska author Piotr Miłkowski author 2019-09 text Proceedings of the International Conference on Recent Advances in Natural Language Processing (RANLP 2019) Ruslan Mitkov editor Galia Angelova editor INCOMA Ltd. Varna, Bulgaria conference publication kocon-etal-2019-multi-level 10.26615/978-954-452-056-4_066 https://aclanthology.org/R19-1066/ 2019-09 559 567