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. Available on Internet: <https://annals-csis.org/proceedings/2020/pliks/fedcsis.pdf> ISBN 978-83-955416-9-8.