Cezary Biele, Janusz Kacprzyk, Jan W. Owsinski, Andrzej Romanowski, Marcin Sikorski: Digital Interaction and Machine Intelligence - Proceedings of MIDI'2020 - 8th Machine Intelligence and Digital Interaction Conference, December 9-10, 2020, Warsaw, Poland (online). Advances in Intelligent Systems and Computing 1376, Springer 2021, ISBN 978-3-030-74727-5