Chen, Haoming, and Hongliang Guo. “MS-PPO: Mean Standard Deviation Proximal Policy Optimization for Reliable Parking Space Search in Structured Environments”. Proceedings of the AAAI Conference on Artificial Intelligence 40, no. 24 (March 14, 2026): 20059–20066. Accessed May 28, 2026. https://ojs.aaai.org/index.php/AAAI/article/view/39091.