海量图书期刊资源，随时随地畅享阅读乐趣
How Open is Open Source? – Software and BeyondKerstin Balka; Christina Raasch; Cornelius Herstatt · 2010
The Effect of Selective Openness on Value Creation in User Innovation CommunitiesBalka, Kerstin; Raasch, Christina; Herstatt, Cornelius · Journal of Product Innovation Management · 2014