@article{PelisoliVosGeieretal.2020,
  author    = {Ingrid Pelisoli and Joris Vos and Stephan Geier and Veronika Schaffenroth and Andrzej S. Baran},
  title     = {Alone but not lonely},
  journal   = {Astronomy and astrophysics : an international weekly journal},
  series    = {observational evidence that binary interaction is always required to form hot subdwarf stars},
  volume    = {642},
  doi       = {10.1051/0004-6361/202038473},
  year      = {2020},
}