Macrotask Crowdsourcing Engaging the Crowds to Address Complex Problems - Khan, Vassillis-Javed; Khan, Vassillis-Javed; Papangelis, Konstantinos; Papangelis, Konstantinos; Lykourentzou, Ioanna; Lykourentzou, Ioanna; Markopoulos, Panos; Markopoulos, Panos (Springer International Publishing : Imprint: Springer, 2019)