Update publications.md (#470)

docs/content/publications.md

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 List of publications & submissions using Minigrid or BabyAI (please open a pull request to add missing entries):
 - [DRED: Zero-Shot Transfer in Reinforcement Learning via Data-Regularised Environment Design](https://arxiv.org/abs/2402.03479) (University of Edinburgh, ICML 2024)
 - [Conviction-Based Planning for Sparse Reward Reinforcement Learning Problems](https://prl-theworkshop.github.io/prl2024-icaps/papers/8.pdf)(UQÀM, PRL @ ICAPS 2024)
+- [Flexible Attention-Based Multi-Policy Fusion for Efficient Deep Reinforcement Learning](https://github.com/Pascalson/KGRL)(UC San Diego, UC Santa Barbara, NeurIPS 2023)
 - [Learning from Active Human Involvement through Proxy Value Propagation](https://metadriverse.github.io/pvp/)(UCLA, NeurIPS Spotlight 2023)
 - [Go Beyond Imagination: Maximizing Episodic Reachability with World Models](https://arxiv.org/pdf/2308.13661.pdf) (UMich, ICML 2023)
 - [Hierarchies of Reward Machines](https://arxiv.org/abs/2205.15752) (Imperial College London, ILASP, Universitat Pompeu Fabra, ICML 2023)