Media type: E-Article Title: Automatic generation and recommendation of personalized challenges for gamification Contributor: Khoshkangini, Reza; Valetto, Giuseppe; Marconi, Annapaola; Pistore, Marco imprint: Springer Science and Business Media LLC, 2021 Published in: User Modeling and User-Adapted Interaction Language: English DOI: 10.1007/s11257-019-09255-2 ISSN: 0924-1868; 1573-1391 Origination: Footnote: