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Petrat G, Klein U, Meissner W.Petrat G, et al. Among authors: klein u.Eur J Pediatr Surg. 1997 Feb;7(1):38-41. doi: 10.1055/s-2008-1071046.Eur J Pediatr Surg. 1997.PMID: 9085807
Klinzing S, Lesser T, Schubert H, Bartel M, Klein U.Klinzing S, et al. Among authors: klein u.Res Exp Med (Berl). 2000 Jun;199(6):333-40. doi: 10.1007/s004339900043.Res Exp Med (Berl). 2000.PMID: 10945651
Gottschall R, Klein U, Friebel U.Gottschall R, et al. Among authors: klein u.Z Erkr Atmungsorgane. 1989;172(3):208-14.Z Erkr Atmungsorgane. 1989.PMID: 2800606German.
Klein U, Karzai W, Zimmermann P, Hannemann U, Koschel U, Brunner JX, Remde H.Klein U, et al.Intensive Care Med. 1998 Dec;24(12):1289-93. doi: 10.1007/s001340050764.Intensive Care Med. 1998.PMID: 9885882
Schwarzkopf K, Schreiber T, Bauer R, Schubert H, Preussler NP, Gaser E, Klein U, Karzai W.Schwarzkopf K, et al. Among authors: klein u.Anesth Analg. 2001 Dec;93(6):1434-8, table of contents. doi: 10.1097/00000539-200112000-00017.Anesth Analg. 2001.PMID: 11726419
Klein U, Seifert A, Koch J, Gottschall R, Schirrmeister W.Klein U, et al.Z Erkr Atmungsorgane. 1988;170(1):79-86.Z Erkr Atmungsorgane. 1988.PMID: 3388902German.