Algorithms and Models for the Web Graph 15th International Workshop, WAW 2018, Moscow, Russia, May 17-18, 2018, Proceedings - Bonato, Anthony; Bonato, Anthony; Prałat, Paweł; Prałat, Paweł; Raigorodskii, Andrei; Raigorodskii, Andrei (Springer International Publishing : Imprint: Springer, 2018)