Attempts at measuring pulmonary arterial pressure by means of Doppler echocardiography in patients with chronic lung disease
A Torbicki, K Skwarski, I Hawrylkiewicz, T Pasierski, Z Miskiewicz, J Zielinski
European Respiratory Journal 1989 2: 856-860; DOI: 10.1183/09031936.93.02090856