@techreport{HartungKamaraSacarea97,
	title = {A topological representation for polarity lattices},
	author = {G. Hartung and M. Kamara and C. Sacarea},
	institution = {TH Darmstadt},
	type = {FB4--Preprint},
	year = {1997},
	biburl = {http://www.bibsonomy.org/bibtex/2af5595658187df1497bf25f9a444d2c5/stumme},
	description = {FCA publications after 1995},
	keywords = {ag1 analysis begriffsanalyse concept darmstadt fba fca formal formale forschungsgruppe lattices tu }
}

@article{Hartung95,
	title = {Sublattices of topologically represented
	  lattices},
	author = {Gerd Hartung},
	journal = {Acta Math.~Univ.~Comenianae},
	pages = {25-41},
	volume = {LXIV},
	year = {1995},
	biburl = {http://www.bibsonomy.org/bibtex/289c2bff18a335c6f12149c7fc24a49cb/stumme},
	description = {FCA publications after 1995},
	keywords = {ag1 analysis begriffsanalyse concept darmstadt fba fca formal formale forschungsgruppe lattices tu }
}

@mastersthesis{Hartung89,
	title = { Darstellung beschr{\"a}nkter Verb{\"a}nde als Verb{\"a}nde
      offener Begriffe },
	author = {Gerd Hartung},
	school = { TH Darmstadt },
	year = { 1989 },
	biburl = {http://www.bibsonomy.org/bibtex/2ab81bdbeec2d4fe7c4ed1de221e5ed96/stumme},
	description = {FCA publications until 1980},
	keywords = {ag1 analysis begriffsanalyse concept darmstadt fba fca formal formale forschungsgruppe lattices tu }
}