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Bernhard A, Yacoub M, Regensburger D, Sievers HH, Smith RR, Stephan E, Lange PE, Keck EW, Heintzen PH.Bernhard A, et al. Among authors: keck ew.Thorac Cardiovasc Surg. 1981 Jun;29(3):138-42. doi: 10.1055/s-2007-1023463.Thorac Cardiovasc Surg. 1981.PMID: 6167010
Yacoub M, Bernhard A, Lange P, Radley-Smith R, Keck E, Stephan E, Heintzen P.Yacoub M, et al.Circulation. 1980 Aug;62(2 Pt 2):I190-6.Circulation. 1980.PMID: 7397994
Lange P, Stephan E, Hüttig G, Bürsch J, Simon R, Keck EW, Heintzen P, Bernhard A.Lange P, et al. Among authors: keck ew.Thoraxchir Vask Chir. 1973 Oct;21(5):473-6. doi: 10.1055/s-0028-1099075.Thoraxchir Vask Chir. 1973.PMID: 4544434German.No abstract available.