FedCSIS FedCSIS : Proceedings of the 2020 federated conference on computer science and information systems. Sofia, Bulgaria. September 6-9, 2020. -- Piscataway : IEEE, 2020. -- (Annals of Computer Science and Information Systems, ; Vol. 21 ISSN 2300-5963). -- ISBN : 978-83-955416-9-8. -- 978-83-955416-8-1 (USB). -- 978-83-955416-7-4 (online). -- CFP2085N-ART. -- 10.15439/978-83-955416-7-4.