Cybulski , G., W. Niewiadomski, A. Zielińska, A. Strasz, and A. Gąsiorowska. “An Impedance Cardiography – Simple, Noninvasive Method for Determination of Cardiac Stroke Volume. Part 1. Methodical Basis”. Cardiology in Practice, Vol. 5, no. 2, June 2011, pp. 61-69, https://journalsmededu.pl/index.php/kwp/article/view/1607.