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  publisher = {Springer-Verlag},
  title = {Varieties of Lattices},
  year = 1992
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@article{WilleGer,
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  title = {General Lattice Theory},
  year = 1998
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@article{Day,
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@phdthesis{Geyer,
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  interhash = {318f8784d05f2a85352ace9a528bf766},
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  school = {Technische Hochschule Darmstadt, Fachbereich Mathematik},
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@article{Jonsson68,
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