https://en.wikipedia.org/wiki/AA_tree

https://neerc.ifmo.ru/wiki/index.php?title=AA-%D0%B4%D0%B5%D1%80%D0%B5%D0%B2%D0%BE

https://www.geeksforgeeks.org/aa-trees-set-1-introduction/

2016
http://www.cse.chalmers.se/edu/year/2016/course/DIT960/slides/9.pdf
2011
https://habr.com/ru/post/110212/
https://web.eecs.umich.edu/~sugih/courses/eecs281/f11/lectures/12-AAtrees+Treaps.pdf
1993
http://user.it.uu.se/~arnea/ps/simp.pdf