Hayano J, Yasuma F, Okada A, Mukai S, Fujinami T, Respiratory sinus arrhythmia. A phenomenon improving pulmonary gas exchange and circulatory efficiency, in Circulation, vol. 94, n. 4, agosto 1996, pp. 842–7, PMID8772709.
Grossman P, van Beek J, Wientjes C, A comparison of three quantification methods for estimation of respiratory sinus arrhythmia, in Psychophysiology, vol. 27, n. 6, novembre 1990, pp. 702–14, PMID2100356.
Grossman P, Karemaker J, Wieling W, Prediction of tonic parasympathetic cardiac control using respiratory sinus arrhythmia: the need for respiratory control, in Psychophysiology, vol. 28, n. 2, marzo 1991, pp. 201–16, PMID1946886.
Porges SW, The Polyvagal Theory: phylogenetic contributions to social behavior, in Physiology & Behavior, vol. 79, n. 3, agosto 2003, pp. 503–13, PMID12954445.
Porges SW, Social engagement and attachment: a phylogenetic perspective, in Annals of the New York Academy of Sciences, vol. 1008, dicembre 2003, pp. 31–47, PMID14998870.
Heart rate variability. Standards of measurement, physiological interpretation, and clinical use. Task Force of the European Society of Cardiology and the North American Society of Pacing and Electrophysiology, in European Heart Journal, vol. 17, n. 3, marzo 1996, pp. 354–81, PMID8737210.