Long, X., Haakma, R., Leufkens, T. R. M., Fonseca, P., & Aarts, R. M. (2015). Effects of Between- and Within-Subject Variability on Autonomic Cardiorespiratory Activity during Sleep and Their Limitations on Sleep Staging: A Multilevel Analysis. Comput Intell Neurosci.

Long, Xi, Reinder Haakma, Tim R. M. Leufkens, Pedro Fonseca, a Ronald M. Aarts. "Effects of Between- and Within-Subject Variability On Autonomic Cardiorespiratory Activity During Sleep and Their Limitations On Sleep Staging: A Multilevel Analysis." Comput Intell Neurosci 2015.

Long, Xi, et al. "Effects of Between- and Within-Subject Variability On Autonomic Cardiorespiratory Activity During Sleep and Their Limitations On Sleep Staging: A Multilevel Analysis." Comput Intell Neurosci 2015.