Pasi Tyrväinen Juhani Warsta Veikko Seppänen Evolution of Secondary Software Businesses: Understanding Industry Dynamics. 381-401 2008 Open IT-Based Innovation http://dx.doi.org/10.1007/978-0-387-87503-3_22 conf/ifip8-6/2008 db/conf/ifip8-6/ifip8-6-2008.html#TyrvainenWS08