author = "Wichura, Michael J.",

@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",
}