6Malliani A, Lombardi F, Pagani M. Power spectrum analysis of heart rate variability: a tool to explore neural regulatory mechanisms. Br Heart J, 1994,71:1-2.
7Galletly DC,Buckley DH, Robinson BJ, et al. Heart rate variability during propofol anaesthesia. Br J Anaesth, 1994,72:219-220.
8Scheffer GJ, Ten Voorde BJ, Karemaker JM, et al. Effects of thiopentone etomidate and propofol on beat-to-beat cardiovascular signals in man. Anaesthesia, 1993 ,48:849-855.
9Gajraj RJ,Doi M, Mantzaridis H, et al. Analysis of the EEG bispectrum, auditory evoked potentials and the EEG power spectrum during repeated transitions from consciousness to unconsciousness. Br J Anaesth, 1998,80:46-52.
10Komatsu T, Shingu K, Tomemori N, et al. Nitrous oxide activates the supraspinal pain inhibition systems. Acta Anaesthesiol Scand, 1981,25: 519-522.