Luis Pedro Matteo Risoldi Didier Buchs Bruno Barroca Vasco Amaral Composing Visual Syntax for Domain Specific Languages. 889-898 2009 HCI (2) http://dx.doi.org/10.1007/978-3-642-02577-8_97 conf/hci/2009-2 db/conf/hci/hci2009-2.html#PedroRBBA09