Acute Hemodynamic Effects of Iloprost in Primary (Unexplained) Pulmonary Hypertension - Groves, Bertron M; Badesch, David B; Donnellan, Kathleen; Wynne, Kristine; Robertson, Alastair D; Voelkel, Norbert F; Dole, William P; Reeves, John T (Seminars in Respiratory and Critical Care Medicine, 1994)