2023
https://blog.bytebytego.com/p/ep88-linux-boot-process-explained
https://www.linuxjournal.com/content/runlevels-and-boot-process-linux
2022
https://0pointer.de/blog/brave-new-trusted-boot-world.html
    https://www.opennet.ru/opennews/art.shtml?num=57984
2018
https://opensource.com/article/18/1/analyzing-linux-boot-process
    https://habr.com/company/otus/blog/425505/
https://opensource.com/article/17/2/linux-boot-and-startup
    https://habr.com/company/otus/blog/424761/