@article{ReindlSchaffenrothFilizetal.2021,
  author    = {Nicole Reindl and Veronika Schaffenroth and Semih Filiz and Stephan Geier and Ingrid Pelisoli and Souza Oliveira Kepler},
  title     = {Mysterious, variable, and extremely hot},
  journal   = {Astronomy and astrophysics : an international weekly journal / European Southern Observatory (ESO)},
  series    = {White dwarfs showing ultra-high excitation lines: I. Photometric variability},
  volume    = {647},
  doi       = {10.1051/0004-6361/202140289},
  year      = {2021},
}