• Clean global sea : the business model to save the ocean : course teamwork paper [Electronic resource]Tiitmaa, Helen; Kester, Alina; Ahven, KristjanStratos Futuris [Electronic resource] : Business Model Innovation Conference, 19 January 20122012 / 35 p. : ill. [CD-ROM] http://www.ester.ee/record=b4451043*est