Resting fluctuations in arterial carbon dioxide induce significant low frequency variations in BOLD signal. - Richard G. Wise; Kojiro Ide; Marc J. Poulin; Irene Tracey (NeuroImage, 2004)

Control of end-tidal PCO2 reduces middle cerebral artery blood velocity variability: Implications for physiological neuroimaging. - Ashley D. Harris; Kojiro Ide; Marc J. Poulin; Richard Frayne (NeuroImage, 2006)