The Balloon Learning Environment https://research.google/blog/the-balloon-learning-environmen... (https://news.ycombinator.com/item?id=31155137 - 73 points | 10 comments)

(2016) Station-keeping of a high-altitude balloon with electric propulsion and wireless power transmission: A concept study https://www.sciencedirect.com/science/article/abs/pii/S00945...

(2022) Station-keeping for high-altitude balloon with reinforcement learning - https://www.sciencedirect.com/science/article/abs/pii/S02731...

(2023) Resource-Constrained Station-Keeping for Helium Balloons using Reinforcement Learning - https://arxiv.org/abs/2303.01173

Chasing the citations from those papers to previous works can provide a fairly deep rabbit hole of things to read.