Add citation for property fitting and multi-task fine-tuning (#5152)

See title.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Chores**
* Added a new research reference: a 2026 arXiv article on multi‑task
fine‑tuning for atomistic models (new BibTeX entry).
* **Documentation**
* Updated credits/acknowledgements to include the new bibliography item.

<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Signed-off-by: Chenqqian Zhang <100290172+Chengqian-Zhang@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: Chengqian-Zhang

CITATIONS.bib

@@ -408,3 +408,20 @@ @article{Zeng_EnergyFuels_2021_v35_p762
   year         = 2021,
   doi          = {10.1021/acs.energyfuels.0c03211},
 }
+
+@article{Zhang_2026_multitaskfinetuning,
+  annote       = {fit properties and multi-task fine-tuning},
+  author       = {
+    Chengqian Zhang and Duo Zhang and Anyang Peng and Mingyu Guo and Yuzhi
+    Zhang and Lei Wang and Guolin Ke and Linfeng Zhang and Tiejun Li and Han
+    Wang
+  },
+  title        = {
+    {Multi-Task Fine-Tuning Enables Robust Out-of-Distribution Generalization
+    in Atomistic Models}
+  },
+  journal      = {arXiv},
+  year         = 2026,
+  pages        = {2601.08486},
+  doi          = {10.48550/arXiv.2601.08486},
+}

doc/credits.rst

@@ -148,6 +148,12 @@ Cite DeePMD-kit and methods
 
    Mo_npjComputMater_2022_v8_p107
 
+- If fitting properties (e.g. band gap) or multi-task fine-tuning is used,
+
+.. bibliography::
+   :filter: False
+
+   Zhang_2026_multitaskfinetuning
 
 Package Contributors
 =========================