@incollection{Birkhoff,
  author = {Birkhoff, Garrett},
  booktitle = {Colloquium Publications},
  edition = {3.},
  interhash = {155513001f337274bb35db352a6a3a02},
  intrahash = {fefe3c5111aaf07bd2d39c7d6b67f87a},
  publisher = {Amer. Math. Soc.},
  title = {Lattice theory},
  volume = 25,
  year = 1967
}