@book{1,
author     = "Wichura, Michael J.",
keyword    = "pictex",
publisher  = "{\TeX} Users Group",
reprint    = "IN FILE",
title      = "The {\PiCTeX\ } Manual",
year       = "1987",
}

@book{2,
author     = "Knappen, J{\"o}rg and Hubert Partl and Elisabeth Schlegl and Irene Hyna",
keyword    = "latex",
publisher  = "Dante",
reprint    = "IN FILE",
title      = "{\LaTeX~2$_\epsilon$}-Kurzbeschreibung",
year       = "1994",
}

@book{3,
author     = "Lamport, Leslie",
publisher  = "Addison-Wesley Co., Inc.",
reprint    = "IN FILE",
title      = "{\LaTeX} a document preparation system",
year       = "1985",
}

@book{4,
author     = "Knuth, Donald E.",
keyword    = "tex
latex
Knuth",
publisher  = "Addison-Wesley Co., Inc.",
reprint    = "IN FILE",
title      = "The {\TeX}book",
year       = "1991",
}