Internet of Things, Smart Spaces, and Next Generation Networks and Systems : 21st International Conference, NEW2AN 2021, and 14th Conference, RuSMART 2021, St. Petersburg, Russia, August 26-27, 2021, Proceedings - Koucheryavy, Yevgeni; Andreev, Sergey; Balandin, Sergey (Cham Springer International Publishing AG, 2022)