Paul Johannesson Birger Andersson Maria Bergholtz Hans Weigand Enterprise Modelling for Value Based Service Analysis. 153-167 2008 PoEM http://dx.doi.org/10.1007/978-3-540-89218-2_12 conf/ifip8-1/2008 db/conf/ifip8-1/poem2008.html#JohannessonABW08