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Billman G. E. (2011). Heart rate variability – a historical perspective. Front. Physiol. 2:86. 10.3389/fphys.2011.00086
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Billman G. E. (2013a). The LF/HF ratio does not accurately measure cardiac sympatho-vagal balance. Front. Physiol. 4:26. 10.3389/fphys.2013.00026
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Billman G. E. (2013b). The effect of heart rate on the heart rate variability response to autonomic interventions. Front. Physiol. 4:222. 10.3389/fphys.2013.00222
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Bravi A., Green G., Herry C., Wright H. E., Longtin A., Kenny G. P., et al. . (2013). Do physiological and pathological stresses produce different changes in heart rate variability? Front. Physiol. 4:197. 10.3389/fphys.2013.00197
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Carter R., III, Hinojosa-Laborde C., Convertino V. A. (2014). Heart rate variability in patients being treated for dengue viral infection: new insights from mathematical correction of heart rate. Front. Physiol. 5:46. 10.3389/fphys.2014.00046
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