@article{Duq,
  address = {Amsterdam, The Netherlands, The Netherlands},
  author = {Duquenne, Vincent},
  doi = {http://dx.doi.org/10.1016/0012-365X(91)90043-2},
  interhash = {3fcc87180a838828f74fd82d7b6ac209},
  intrahash = {6c41ab93d9468e2b180b0d1a189c2cb8},
  issn = {0012-365X},
  journal = {Discrete Math.},
  number = {2-3},
  pages = {133--147},
  publisher = {Elsevier Science Publishers B. V.},
  title = {The core of finite lattices},
  volume = 87,
  year = 1991
}

@article{GPW,
  author = {Ganter, Bernhard and Poguntke, Werner and Wille, Rudolf},
  interhash = {0ca78ea0263b8ed16512692b01d9f48a},
  intrahash = {bd16dcc0461cbe4b19296828e312a106},
  journal = {Algebra Univ.},
  pages = {160--171},
  title = {Finite sublattices of four-generated modular lattices},
  volume = 12,
  year = 1981
}