2019
https://medium.com/@mahendran.venkatachalam/q-learning-54b841f3f9e4
Edureka - Q Learning Explained | Reinforcement Learning Using Python | Q Learning in AI
    https://www.youtube.com/watch?v=DhdUlDIAG7Y
https://medium.com/@alexeybnk/improving-q-learning-agent-trading-stock-by-adding-recurrency-and-reward-shaping-b9e0ee095c8b
    https://habr.com/ru/post/436628/
2018
https://medium.com/@alexeybnk/can-reinforcement-learning-trade-stock-implementation-in-r-8cd54d13165c
    https://habr.com/ru/post/433182/
2017
https://habrahabr.ru/post/345656/