The Concept of “Direct Mechanical Ventricular Assistance” in the Treatment of Left-Ventricular Failure - Part 2: Results of the New Intrathoracic Implantable Multi-Chamber Pump System (IMPS) in an Animal Study - Feindt, P; Gams, E; Paul, V; Straub, U; Priebe, J; Kasi, A; Meyer, U; Gersonde, K (The Thoracic and Cardiovascular Surgeon, 1995)