Elisabeth Crawford Manuela M. Veloso Mechanism Design for Multi-Agent Meeting Scheduling Including Time Preferences, Availability, and Value of Presence. 253-259 2004 conf/iat/2004 IAT http://csdl.computer.org/comp/proceedings/iat/2004/2101/00/21010253abs.htm db/conf/iat/iat2004.html#CrawfordV04