Rogier M. van Eijk Frank S. de Boer Wiebe van der Hoek John-Jules Ch. Meyer Open Multi-agent Systems: Agent Communication and Integration. 218-232 1999 conf/atal/1999 ATAL db/conf/atal/atal1999.html#EijkBHM99 http://dx.doi.org/10.1007/10719619_16