Media type: E-Article Title: Realtime Crowdsourcing with Payment of Idle Workers in the Retainer Model Contributor: Ellero, Andrea; Ferretti, Paola; Furlanetto, Giovanni Source: Procedia Economics and Finance ; 32 ( 2015 ) S. 20-26 Published: Elsevier BV, 2015 Language: English DOI: 10.1016/s2212-5671(15)01359-3 ISSN: 2212-5671 Keywords: General Medicine