Steffen Lohmann Jürgen Ziegler Philipp Heim Involving End Users in Distributed Requirements Engineering. 221-228 2008 TAMODIA/HCSE http://dx.doi.org/10.1007/978-3-540-85992-5_20 conf/tamodia/2008 db/conf/tamodia/tamodia2008.html#LohmannZH08