The guidelines suggest several useful LaTeX packages. If you do not already have them on your TeX system, you may get them from the Comprehensive TeX Archive Network (CTAN).

CTAN is an archive with up-to-date copies of all the public-domain versions of TeX, LaTeX, Metafont and ancillary programs, which is made available via a mirrored network of FTP servers.

You can enter the CTAN archive via a web interface in   the UK, in   the USA, or in   Germany (page in German). You can search for a package on CTAN via this   interface.

You can also enter the archive via FTP at ftp.tex.ac.uk, at ftp.dante.de, at ctan.tug.org, or at one of the many mirror servers; see   this list or   this list of CTAN mirror sites.

When a CTAN server does not respond, please try another one.

Note that CTAN is not related to Elsevier, and that Elsevier's author support cannot accept complaints or answer questions about the availability of any CTAN server.

These packages are recommended for usage with our document styles:

• The natbib package. Search for   natbib.

• The lineno package. Search for   lineno.

• The hyperref package. Search for   hyperref.

• The various graphics packages. Search for   graphics.

• The various amsfonts packages, including the amssymb package. Search for   amsfonts.