@article{SingerColli2001,
  author    = {Ute Singer and Hermann Colli},
  title     = {Dr. Johann Nepomuk H{\"a}ßler (1898 -1981)},
  journal   = {Villingen im Wandel der Zeit},
  series    = {ein hochgesch{\"a}tzter und verdienstvoller Heimatforscher},
  volume    = {24},
  pages     = {86 -- 91},
  doi       = {10.57962/regionalia-16556},
  year      = {2001},
}