TY  - RPRT
TI  - Pulsed multifrequency photoplethysmograph.
AU  - J Giltvedt
AU  - A Sira
AU  - P Helme
PY  - 1984
DO  - 10.1007/bf02442745
UR  - https://pubmed.ncbi.nlm.nih.gov/6738126/
ID  - 6738126
ER  -