1. (1) J. A. Alhashemi, M. Cecconi, and C. K. Hofer : “Cardiac output monitoring: an integrative perspective”, Crit Care, Vol. 15, No. 2, 214 (2011)
2. (2) W. G. Kubicek, A. H. From, R. P. Patterson, D. A. Witsoe, A. Castaneda, R. C. Lillehei, and R. Ersek : “Impedance cardiography as a noninvasive means to monitor cardiac function”, J Assoc Adv Med Instrum, Vol. 4, No. 2, pp. 79-84 (1970)
3. (3) W. G. Kubicek, J. N. Karnegis, R. P. Patterson, D. A. Witsoe, and R. H. Mattson : “Development and evaluation of an impedance cardiac output system”, Aerosp Med, Vol. 37, No. 12, pp. 1208-1212 (1966)
4. (4) H. Ito, K. I. Yamakoshi, and T. Togawa : “Transthoracic admittance plethysmograph for measuring cardiac output”, J Appl Physiol, Vol. 40, No. 3, pp. 451-454 (1976)
5. (5) K. Yamakoshi : “Unconstrained physiological monotoring in daily living for health care”, Front Med Biol Eng, Vol. 10, No. 3, pp. 239-259 (2000)