Computational Science and Its Applications - ICCSA 2021 : 21st International Conference, Cagliari, Italy, September 13-16, 2021, Proceedings, Part VIII - Gervasi, Osvaldo; Apduhan, Bernady O.; Blečić, Ivan; Garau, Chiara; Misra, Sanjay; Murgante, Beniamino; Rocha, Ana Maria A. C.; Taniar, David; Tarantino, Eufemia; Torre, Carmelo Maria (Springer International Publishing, 2021)