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1. https://github.com/openai/procgen

2. Leveraging Procedural Generation to Benchmark Reinforcement Learning

3. https://openai.com/research/quantifying-generalization-in-reinforcement-learning

4. Quantifying Generalization in Reinforcement Learning

5. The Neural MMO Platform for Massively Multiagent Research

6. Wikipedia Bibliography:

   1. Reinforcement learning

   2. OpenAI