Arxiv is a page about technical topics such as physics where you can find some roulette PDF downloads such as:
Predicting the outcome of roulette
https://arxiv.org/abs/1204.6412
Biased Roulette Wheel: A Quantitative Trading Strategy Approach
https://arxiv.org/abs/1609.09601
others:
https://arxiv.org/find/all/1/all:+roulette/0/1/0/all/0/1
Thanks for sharing. 8)