@article{Haenel2005,
  author    = {Berthold H{\"a}nel},
  title     = {Hans Martin Erhardt},
  journal   = {Badische Heimat},
  series    = {zum 70. Geburtstag des Malers und Grafikers},
  volume    = {85},
  number    = {4},
  pages     = {615 -- 618},
  doi       = {10.57962/regionalia-88},
  year      = {2005},
}