@article{MR1407366,
  title = "The universal covers of the sporadic semibiplanes",
  author = "Baumeister, Barbara and Pasechnik, Dmitrii V.",
  year = "1996",
  issn = "0195-6698",
  journal = "European J. Combin.",
  mrnumber = "MR1407366 (97i:51019)",
  number = "7",
  pages = "595--604",
  volume = "17",
}