David Cornforth Michael Kirley Terry Bossomaier Agent Heterogeneity and Coalition Formation: Investigating Market-Based Cooperative Problem Solving. 556-563 2004 conf/atal/2004 AAMAS http://csdl.computer.org/comp/proceedings/aamas/2004/2092/02/20920556abs.htm db/conf/atal/aamas2004-2.html#CornforthKB04