2021
https://www.blog.pythonlibrary.org/2021/12/07/a-tour-of-pythons-itertools-library/
2020
https://proglib.io/p/iteriruemsya-pravilno-20-priemov-ispolzovaniya-v-python-modulya-itertools-2020-01-03
https://habr.com/ru/company/otus/blog/529356/
2017
https://realpython.com/python-itertools/