Michael Guntsch Martin Middendorf Pheromone Modification Strategies for Ant Algorithms Applied to Dynamic TSP. 213-222 2001 conf/evoW/2001 EvoWorkshops http://link.springer.de/link/service/series/0558/bibs/2037/20370213.htm db/conf/evoW/evoW2001.html#GuntschM01