Henk, H. H. ; Opitz, H. (Thesis advisor) ; Backé, W. (Thesis advisor)
URL: https://publications.rwth-aachen.de/record/822660/files/822660_kardex.pdf
Bündgens-Kosten, J. (Author) ; Meyer, P. G. (Thesis advisor)
URN: urn:nbn:de:hbz:82-opus-29364