  In most fields, computational models and data analysis have become a
significant part of how research is performed, in addition to the more
traditional theory and experiment. Mathematics is no exception to this trend.
While the system of publication and credit for theory and experiment (journals
and books, often monographs) has developed and has become an expected part of
the culture, how research is shared and how candidates for hiring, promotion
are evaluated, software (and data) do not have the same history. A group
working as part of the FORCE11 community developed a set of principles for
software citation that fit software into the journal citation system, allow
software to be published and then cited, and there are now over 50,000 DOIs
that have been issued for software. However, some challenges remain, including:
promoting the idea of software citation to developers and users; collaborating
with publishers to ensure that systems collect and retain required metadata;
ensuring that the rest of the scholarly infrastructure, particularly indexing
sites, include software; working with communities so that software efforts
"count" and understanding how best to cite software that has not been
published.
