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van Ahlen H, Porst H, Löcherbach-Zawadzky A, Klingmüller D.van Ahlen H, et al.Dtsch Med Wochenschr. 1988 Jul 1;113(26):1047-52. doi: 10.1055/s-2008-1067764.Dtsch Med Wochenschr. 1988.PMID: 3133190German.
Porst H, van Ahlen H, Tackmann W, Köster O, Vahlensieck W.Porst H, et al. Among authors: van ahlen h.Aktuelle Traumatol. 1987 Oct;17(5):196-203.Aktuelle Traumatol. 1987.PMID: 2891247German.
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van Ahlen H, Brühl P, Porst H.van Ahlen H, et al.Dtsch Med Wochenschr. 1987 Feb 6;112(6):231-3. doi: 10.1055/s-2008-1068036.Dtsch Med Wochenschr. 1987.PMID: 3542473German.No abstract available.