“Comparison of Non-Invasive Methods – Impedance Cardiography and 2-Dimentional Transthoracic Echocardiography Applied for Diagnostics of Pulmonary Artery Hypertension”. Elektronika Ir Elektrotechnika, vol. 105, no. 9, Oct. 2010, pp. 105-8, https://eejournal.ktu.lt/index.php/elt/article/view/9190.