Update README.md

README.md

@@ -160,9 +160,11 @@ AAA-HiTSR/
 If you use this dataset in your research, please cite:
 
 ```bibtex
-@dataset{aaa_hitsr_2024,
-  title={AAA-HiTSR: A Comprehensive Multimodal Time Series Understanding Dataset},
-  year={2024}
+@article{llatisa2026,
+  title={LLaTiSA: Towards Difficulty-Stratified Time Series Reasoning from Visual Perception to Semantics},
+  author={Yueyang Ding, HaoPeng Zhang, Rui Dai, Yi Wang, Tianyu Zong, Kaikui Liu, Xiangxiang Chu},
+  journal={arxiv preprint arxiv: 2604.17295},
+  year={2026}
 }
 ```