Brute - Force Sentence Pattern Extortion from Harmful Messages for Cyberbullying Detection. - Michal Ptaszynski; Pawel Lempa; Fumito Masui; Yasutomo Kimura; Rafal Rzepka; Kenji Araki; Michal Wroczynski; Gniewosz Leliwa (J. Assoc. Inf. Syst., 2019)