【作者(必填)】Davide Semenzin,Edwin Meulendijks,Wilbert Seele,Christoph Wagner,Sjaak Brinkkemper

【文题(必填)】Differentiation in Freemium: Where Does the Line Lie?

【年份(必填)】Software Business-Lecture Notes in Business Information Processing Volume 114, 2012, pp 291-296

【全文链接或数据库名称(选填)】http://link.springer.com/chapter/10.1007/978-3-642-30746-1_27