@incollection{Birkhoff67,
  author = {Birkhoff, G.},
  booktitle = {Colloquium Publications},
  interhash = {155513001f337274bb35db352a6a3a02},
  intrahash = {7de09243f587bbbb4ee4aef41f1b7432},
  note = {Third edition},
  publisher = {American Mathematical Society},
  title = {Lattice theory},
  volume = 25,
  year = 1967
}