@incollection{Heller2018,
  author    = {Klaus Heller},
  title     = {Zum Graphembegriff},
  series = {Theoretische Probleme der deutschen Orthographie},
  editor    = {Dieter Nerius and J{\"u}rgen Scharnhorst},
  publisher = {Akademie-Verlag},
  address   = {Berlin},
  url       = {https://nbn-resolving.org/urn:nbn:de:bsz:mh39-83922},
  pages     = {74 -- 108},
  year      = {2018},
  language  = {de}
}