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Klein G, Wirtzfeld A, Schlegel J, Himmler C, Neiss A.Klein G, et al.Dtsch Med Wochenschr. 1980 Feb 8;105(6):189-94. doi: 10.1055/s-2008-1070632.Dtsch Med Wochenschr. 1980.PMID: 6153310Clinical Trial.German.
Permanetter B, Baumann G, Wirtzfeld A, Günes S, Stinshoff M, Klein G.Permanetter B, et al. Among authors: klein g.Z Kardiol. 1989 May;78(5):335-42.Z Kardiol. 1989.PMID: 2660451Clinical Trial.German.
Wirtzfeld A, Klein G, Bibra HV, Sauer E.Wirtzfeld A, et al. Among authors: klein g.Int J Clin Pharmacol Ther Toxicol. 1985 Jan;23(1):20-7.Int J Clin Pharmacol Ther Toxicol. 1985.PMID: 2859252
Wirtzfeld A, Schmidt G, Himmler FC, Klein G, Sauer E.Wirtzfeld A, et al. Among authors: klein g.Dtsch Med Wochenschr. 1980 Apr 11;105(15):525-30. doi: 10.1055/s-2008-1070701.Dtsch Med Wochenschr. 1980.PMID: 6988194Review.German.No abstract available.