Lee Spector Jon Klein Chris Perry Mark Feinstein Emergence of Collective Behavior in Evolving Populations of Flying Agents. 111-125 2005 6 Genetic Programming and Evolvable Machines 1 http://www.springerlink.com/index/10.1007/s10710-005-7620-3 db/journals/gpem/gpem6.html#SpectorKPF05