S. Sadauskas, “Comparison of Non-invasive Methods – Impedance Cardiography and 2-dimentional Transthoracic Echocardiography Applied for Diagnostics of Pulmonary Artery Hypertension”, ELEKTRON ELEKTROTECH, vol. 105, no. 9, pp. 105–108, Oct. 2010, doi: 10.5755/j02.eie.9190.