http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Giwer, Margret -- Spondylolyse und Spondylolisthesis. -- o.O. 1965. 64 S. -- Saarbrücken/Homburg, Med. Diss. v. 24.7.1964