Simulation of daytime vigilance by the additive interaction of a homeostatic and a circadian process. - Peter Achermann; Alexander A. Borbély (Biol. Cybern., 1994)

Functional EEG topography in sleep and waking: State-dependent and state-independent features. - Gilberte Tinguely; Luca A. Finelli; Hans-Peter Landolt; Alexander A. Borbély; Peter Achermann (NeuroImage, 2006)