TY  - RPRT
TI  - Measuring heart rate variability: some comments on the successive difference mean square statistic.
AU  - D G Wastell
PY  - 1981
DO  - 10.1111/j.1469-8986.1981.tb01550.x
UR  - https://pubmed.ncbi.nlm.nih.gov/7465734/
ID  - 7465734
ER  -