1. Preoperative evaluation of the pulmonary vascular bed in patients with pulmonary hypertension associated with left to right shunts. I. Effect of acetylcholine: Preliminary report;Crittenden;Pediatrics,1959
2. Further observations of the natural course of ventricular septal defects; new clinical and physiologic data;Gasul;Circulation,1957
3. The natural history of pulmonary hypertension in children with ventricular septal defects assessed by right heart catheterization;Stanton;Pediatrics,1961
4. Social physiologic studies of the natural course of 33 infants and children with ventricular septal defects;Lynfield;Circulation,1959
5. Natural history of ventricular septal defect;Kaplan;Am. J. Dis. Child.,1963