Danilo Beuche Andreas Birk Heinrich Dreier Andreas Fleischmann Heidi Galle Gerald Heller Dirk Janzen Isabel John Ramin Tavakoli Kolagari Thomas von der Maßen Andreas Wolfram Using Requirements Management Tools in Software Product Line Engineering: The State of the Practice. 84-96 2007 SPLC http://doi.ieeecomputersociety.org/10.1109/SPLINE.2007.15 conf/splc/2007 db/conf/splc/splc2007.html#BeucheBDFGHJJKMW07