@book{Pawelke1969,
  author    = {Pawelke, Siegfried},
  title     = {Saturation und Approximation bei Reihen mehrdimensionaler Kugelfunktionen},
  publisher = {Techn. Hochsch.},
  address   = {Aachen},
  pages     = {97 S.},
  year      = {1969},
  language  = {de}
}
@book{OPUS4-10758,
  title     = {Baukeramik},
  organization    = {Ullersdorfer Werke},
  pages     = {40 Seiten},
  year      = {1925},
  language  = {de}
}