@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
}