Sadauskas S, Naudžiūnas A, Unikauskas A, et al. Comparison of Non-invasive Methods – Impedance Cardiography and 2-dimentional Transthoracic Echocardiography Applied for Diagnostics of Pulmonary Artery Hypertension. ELEKTRON ELEKTROTECH. 2010;105(9):105-108. doi:10.5755/j02.eie.9190