Ullsperger, Markus MPI of Cognitive Neuroscience (Leipzig, -2003), The Prior Institutes, MPI for Human Cognitive and Brain Sciences, Max Planck Society;
Ullsperger, M. (2002). Error processing and response competition: A comparison of models of performance monitoring. Brain and Cognition, 48(2-3), 239-240. doi:10.1006/brcg.2001.1342.