Analysis of images, social networks and texts 9th international conference, AIST 2020, Skolkovo, Moscow, Russia, October 15–16, 2020, revised selected papers - Aalst, Wil van der 1966-; Batagelj, Vladimir; Ignatov, Dmitry I.; Khachay, Michael; Koltsova, Olessia; Kutuzov, Andrey; Kuznetsov, Sergei O.; Lomazova, Irina A.; Loukachevitch, Natalia; Napoli, Amedeo; Panchenko, Alexander; Pardalos, Panos M.; et al. (Springer, 2021)