1Channick RN,Newhart JW,Johnson FW,et al.Pulsed delivery of inhaled nitric oxide to patients with primary pulmonary hypertension.An ambulatory delivey system and initial clinical tests.Chest,1996,109:1545.
2Galie N,Ussia G,Passarelli P,et al.Role of pharmacologic tests in the treatment of primary pulmonry hypertension.Am J Cardlol,1995,75:55A.
