@book{ La85,
author = {Lamport, Leslie},
title = {\LaTeX: A Document Preparation System},
publisher = {Addison-Wesley},
year = {1985},
isbn = {0-201-15790-X}
}
@manual{GAP4,
key = "GAP",
organization = "The GAP Group",
title = {{GAP} -- {G}roups, {A}lgorithms, and
{P}rogramming, Version 4.3},
year = 2002,
address = "Aachen, St~Andrews",
note = "http://www.gap-system.org",
keywords = "groups; *; gap; manual"
}