- Cezary Biele, Janusz Kacprzyk, Wieslaw Kopec, Jan W. Owsinski, Andrzej Romanowski, Marcin Sikorski, editors, Digital Interaction and Machine Intelligence - Proceedings of MIDI'2021 - 9th Machine Intelligence and Digital Interaction Conference, December 9-10, 2021, Warsaw, Poland. Volume 440 of Lecture Notes in Networks and Systems, Springer, 2022.