References used when writing the CGM driver include:

    The WebCGM profile, available at http://www.w3.org/TR/REC-WebCGM as an
    official recommendation of the World Wide Web Consortium.

    "The CGM Handbook", L. R. Henderson and A. Mumford (Academic, 1992).

    "CGM and CGI", D. B. Arnold and P. R. Bono (Springer-Verlag, 1988).

    Sourcecode for cd-1.3, also called CD, cgmdraw 1.3, and CGM Draw 1.3, a
    freely available C function library for generating version-1 CGM files.
    cd-1.3 was developed at NIST (the U.S. National Institute for Standards
    and Technology) by G. Edward Johnson (formerly, lorax@nist.gov).
    However, it no longer seems to be available through NIST Web pages.

    Sourcecode for RALCGM, a free viewer for version-1 CGM files developed
    at Rutherford Appleton Laboratory in the U.K.  Available at
    ftp://ftp.cc.rl.ac.uk/pub/graphics/ralcgm/unix/ .

    http://www.posc.org/Epicentre.2_2/GraphicsMetafile/SeismicExtensions/ .
    Contains a GIF image of the section from the CGM specification dealing
    with the format of SDR's (structured data records, used in specifying
    font properties in version-3 CGM files).

    http://www.nist.gov/itl/div897/ctg/cgm_form.htm .
    Sample CGM files, forming test suites, distributed by the US NIST
    (National Institute of Standards and Technology).
