@incollection{TapaniPiirainen2014,
  author    = {Ilpo Tapani Piirainen},
  title     = {Variationen der Schreibschwierigkeiten deutscher Sprache in der historischen Entwicklung},
  series = {Schriftsprachlichkeit},
  editor    = {Siegfried Grosse},
  publisher = {Schwann},
  address   = {D{\"u}sseldorf},
  isbn      = {3-590-15659-7},
  url       = {https://nbn-resolving.org/urn:nbn:de:bsz:mh39-19822},
  pages     = {10 -- 23},
  year      = {2014},
  language  = {de}
}