Loïc Hélouët Marc Zeitoun Aldric Degorre Scenarios and Covert Channels: Another Game... 93-116 2005 119 Electr. Notes Theor. Comput. Sci. 1 http://dx.doi.org/10.1016/j.entcs.2004.07.010 db/journals/entcs/entcs119.html#HelouetZD05