@Article{erne1993distributive,
  author = {Erné, Marcel},
  title  = {Distributive laws for concept lattices},
  journal = {Algebra Universalis},
  year   = {1993},
  number = {},
  url    = {http://dx.doi.org/10.1007/BF01195382},
  doi = {10.1007/BF01195382},
  const  = {\ text}
}
@Article{GratzerLasker,
  author = {Gr\"atzer, George and Lakser, Henry},
  title  = {On Complete Congruence Lattices of Complete Lattices},
  journal = {Trans. Amer. Math. Soc.},
  year   = {1991},
  number = {1},
  url    = {},

  const  = {\ text}
}
@Article{hales1964nonexistence,
  author = {Hales, A. W.},
  title  = {On the non-existence of free complete Boolean algebras},
  journal = {Fundamentae Mathematica},
  year   = {1964},
  number = {},
  url    = {http://matwbn.icm.edu.pl/tresc.php?wyd=1&tom=54},

  const  = {\ text}
}