Penn, M S.(2013). An Open-Label Dose Escalation Study to Evaluate the Safety of Administration of Nonviral Stromal Cell-Derived Factor-1 Plasmid to Treat Symptomatic Ischemic Heart Failure. Circulation Research, 112(5), 816-825. doi:10.1161/circresaha.111.300440

Penn, Marc S. "An Open-Label Dose Escalation Study to Evaluate the Safety of Administration of Nonviral Stromal Cell-Derived Factor-1 Plasmid to Treat Symptomatic Ischemic Heart Failure". Circulation Research, 112.5 ( 2013 ): 816-825.