Franck Cassez Jérémy Dubreil Hervé Marchand Dynamic Observers for the Synthesis of Opaque Systems. 352-367 2009 ATVA http://dx.doi.org/10.1007/978-3-642-04761-9_26 conf/atva/2009 db/conf/atva/atva2009.html#CassezDM09