  The Web is our primary source of all kinds of information today. This
includes information about software as well as associated materials, like
source code, documentation, related publications and change logs. Such data is
of particular importance in research in order to conduct, comprehend and
reconstruct scientific experiments that involve software. swMATH, a
mathematical software directory, attempts to identify software mentions in
scientific articles and provides additional information as well as links to the
Web. However, just like software itself, the Web is dynamic and most likely the
information on the Web has changed since it was referenced in a scientific
publication. Therefore, it is crucial to preserve the resources of a software
on the Web to capture its states over time.
  We found that around 40% of the websites in swMATH are already included in an
existing Web archive. Out of these, 60% of contain some kind of documentation
and around 45% even provide downloads of software artifacts. Hence, already
today links can be established based on the publication dates of corresponding
articles. The contained data enable enriching existing information with a
temporal dimension. In the future, specialized infrastructure will improve the
coverage of software resources and allow explicit references in scientific
publications.
