1. Barnett, A. (1937) The basic factors involved in proposed electrical methods for measuring thyroid function.West. J. Surg. Obstet. and Gynec.,45, 540–554.
2. Burns, R. C. (1950) Study of skin impedance.Electronics,23, 190.
3. Einthoven, W. (1928) Die Aktionsstrome des Herzens InHandbuch Der Normalen Und Pathologischen Physiologie. Energieumsatz (Zweiter Teil) p. 785. Verlag-Springer, Berlin.
4. Feates, F. S., Ives, D. J. G. andPryor, J. H. (1956) Alternating current bridge for measurement of electrolytic conductance.J. electrochem. Soc.,103, 580–585.
5. Geddes, L. A., Partridge, M. andHoff, H. E. (1960) An EKG lead for exercising subjects.J. appl. Physiol.,15, 311–312.