Tighe DA, Thomas NV, Hafer JG, Rousou JA, Engelman RM, Anene CA, Fernandez E, Rifkin RD. Diagnosis of Partial Anomalous Pulmonary Venous Connection with Intact Interatrial Septum by Echocardiography. Echocardiography. 1998 May; 15(4):405-408.