RT Journal Article SR Electronic T1 Mock Circulation to test Pumps Designed for Permanent Replacement of Damaged Hearts JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 223 OP 226 VO 26 IS 4 A1 Willem J. Kolff YR 1959 UL http://www.ccjm.org/content/26/4/223.abstract AB