@article{MR1395064,
  title = "Multiple extensions of generalized hexagons related to the simple groups {${\rm McL}$} and {${\rm Co}\sb 3$}",
  author = "Cuypers, Hans and Kasikova, Anna and Pasechnik, Dmitrii V.",
  year = "1996",
  issn = "0024-6107",
  journal = "J. London Math. Soc. (2)",
  mrnumber = "MR1395064 (97i:51007)",
  number = "1",
  pages = "16--24",
  volume = "54",
}