1. Bendat JS, Piersol AG (1971) Random data: Analysis and measurement procedures. Wiley Interscience, New York
2. de Pater L, van den Berg JW, Bueno AA (1962) A very sensitive photoplethysmograph using scattered light and a photosensitive resistance. Acta Physiol Pharmacol Neerlandica 10: 378–390
3. Imholz BPM, van Montfrans GA, Settels J J, van der Hoeven GMA, Wieling W, Karemaker JM (1988) Continuous, noninvasive blood pressure; Reliability of Finapres during the Valsalva manoeuvre. Car-diovasc ReS (accepted)
4. Marey EJ (1878) La Methode Graphique. G. Masson, Paris
5. Molhoek PC, Wesseling KH, Settels JJ, van Vollenhoven E, Weeda HWH, Arntzenius AC (1984) Evaluation of the Penáz servoplethysmomanometer for the continous, noninvasive measurement of finger blood pressure. Basic Res Cardiol 79: 598–609