Jeanette Heidenberg Andreas Nåls Ivan Porres Statechart features and pre-release maintenance defects. 456-467 2008 19 J. Vis. Lang. Comput. 4 http://dx.doi.org/10.1016/j.jvlc.2008.05.002 db/journals/vlc/vlc19.html#HeidenbergNP08