https://habrahabr.ru/company/badoo/blog/328434/
https://www.infoq.com/articles/rxjava2-by-example
https://zeroturnaround.com/rebellabs/rxjava-for-easy-concurrency-and-backpressure/

eMag:
http://www.infoq.com/resource/minibooks/emag-reactive-programming-java/en/pdf/InfoQ-Reactive-Programming-in-Java-eMag.pdf

2019
https://habr.com/ru/company/oleg-bunin/blog/437592/
    https://www.youtube.com/watch?v=tBC5Zoxcgbk

2014
https://blog.danlew.net/2014/09/15/grokking-rxjava-part-1/