Alain Sidaner Olivier Bailleux Jean-Jacques Chabrier Measuring the Spatial Dispersion of Evolutionary Search Processes: Application to Walksat. 77-90 2001 conf/ae/2001 Artificial Evolution http://link.springer.de/link/service/series/0558/bibs/2310/23100077.htm db/conf/ae/ae2001.html#SidanerBC01