TY - GEN AU - Giltvedt,J AU - Sira,A AU - Helme,P TI - Pulsed multifrequency photoplethysmograph SN - 0140-0118 PY - 1984///0815 KW - Blood Pressure KW - Electronics KW - Humans KW - Infrared Rays KW - Light KW - Plethysmography KW - instrumentation KW - Skin KW - blood supply N1 - Publication Type: Journal Article UR - https://doi.org/10.1007/BF02442745 ER -