Performance engineering and stochastic modeling 17th European Workshop, EPEW 2021, and 26th International Conference, ASMTA 2021, virtual event, December 9-10 and December 13-14, 2021 : proceedings - Ballarini, Paolo; Castel, Hind; Dēmētriu, Iōannēs; Iacono, Mauro 1975-; Phung-Duc, Tuan; Walraevens, Joris (Springer, 2021)