Hess, SteffenSteffenHessCollarana, DiegoDiegoCollaranaDoerr, JoergJoergDoerr2022-03-042022-03-042014https://publica.fraunhofer.de/handle/publica/235749derequirements engineeringmobile appgamificationGamMAuser experience681Requirements Engineering und Konzeption von "Gamified" Appsjournal article