Detecting affective covert user states with passive brain-computer interfaces. - Thorsten Oliver Zander; Sabine Jatzev (ACII, 2009)

Enhancing Human-Computer Interaction with Input from Active and Passive Brain-Computer Interfaces. - Thorsten O. Zander; Christian Kothe; Sabine Jatzev; Matti Gaertner (Brain-Computer Interfaces, 2010)