HTMOT: Hierarchical Topic Modelling over Time Judicael Poumay author Ashwin Ittoo author 2023-09 text Proceedings of the 14th International Conference on Recent Advances in Natural Language Processing Ruslan Mitkov editor Galia Angelova editor INCOMA Ltd., Shoumen, Bulgaria Varna, Bulgaria conference publication poumay-ittoo-2023-htmot https://aclanthology.org/2023.ranlp-1.92/ 2023-09 854 863