LLM4AAMAS: Add willis25arxiv

README.md

@@ -408,6 +408,13 @@ cooperation.
   Dilemma?](https://arxiv.org/abs/2406.13605)** Nicoló Fontana, Francesco
   Pierri, Luca Maria Aiello (2024) Published on arXiv
 
+A study of the impact of different prompting techniques on strategy creation by
+LLMs on the emergent collective cooperative behaviours in the iterated prisoner
+dilemma where aggressive strategies can persist or even dominate.
+
+- **[Will Systems of LLM Agents Cooperate: An Investigation into a Social
+  Dilemma](https://arxiv.org/abs/2501.16173)** Richard Willis, Yali Du, Joel Z.
+  Leibo, Michael Luck (2025) Published on arXiv
 
 ### Generative MAS on the shelf