The Evolution of Non-reciprocal Altruism. - Martijn Brinkers; Paul den Dulk (ECAL, 1999)

Evolution of Altruism in Viscous Populations: Effects of Altruism on the Evolution of Migrating Behavior. - Paul den Dulk; Martijn Brinkers (PPSN, 2000)

Novelty-dependent learning and topological mapping. - R. Hans Phaf; Paul den Dulk; Adriaan G. Tijsseling; Ed Lebert (Connect. Sci., 2001)