Add citation for HyperComplEx (Gajjar et al., 2025) — paper that introduced this dataset

README.md

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 )
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+## Citation
+
+This dataset was introduced in the following paper. **If you use this dataset
+in your work, please cite it.** Please also cite OpenAlex (the source data;
+see their [citation guidance](https://docs.openalex.org)).
+
+**BibTeX:**
+
+```bibtex
+@inproceedings{gajjar2025hypercomplex,
+  title={HyperComplEx: Adaptive Multi-Space Knowledge Graph Embeddings},
+  author={Gajjar, Jugal and Ranaware, Kaustik and Subramaniakuppusamy, Kamalasankari and Gandhi, Vaibhav C},
+  booktitle={2025 IEEE International Conference on Big Data (BigData)},
+  pages={5623--5631},
+  year={2025},
+  organization={IEEE}
+}
+```
+
+**APA:**
+
+> Gajjar, J., Ranaware, K., Subramaniakuppusamy, K., & Gandhi, V. C. (2025, December). HyperComplEx: Adaptive Multi-Space Knowledge Graph Embeddings. In *2025 IEEE International Conference on Big Data (BigData)* (pp. 5623–5631). IEEE.
+
 ## Source and licensing
 
 - **Source data:** [OpenAlex](https://openalex.org), released into the public
@@ -236,8 +259,6 @@ path = hf_hub_download(
   [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/). You may use,
   modify, and redistribute it, including commercially, provided you give
   attribution and license your derivative works under the same terms.
-- Please also cite OpenAlex when using this dataset; see their
-  [citation guidance](https://docs.openalex.org).
 
 ## Repository layout