Noninvasive assessment of surgical systemic to pulmonary artery shunts by range-gated pulsed Doppler echocardiography.
Allen HD, Sahn DJ, Lange L, Goldberg SJ. Noninvasive assessment of surgical systemic to pulmonary artery shunts by range-gated pulsed Doppler echocardiography. J Pediatr. 1979 Mar; 94(3):395-402.