Frustration Level Annotation in Latvian Tweets with Non-Lexical Means of Expression Viktorija Leonova author Janis Zuters author 2021-09 text Proceedings of the International Conference on Recent Advances in Natural Language Processing (RANLP 2021) Ruslan Mitkov editor Galia Angelova editor INCOMA Ltd. Held Online conference publication leonova-zuters-2021-frustration https://aclanthology.org/2021.ranlp-1.93/ 2021-09 814 823