When looking for either Journals or articles contained within a journal only ISSN can be used, however there are journals lacking ISSNs. Within the system those without ISSNs must have a DOI, though there are some older ones that have neither, which we should ignore.
To find the ones without an ISSN we should implement both a journals route and as a container-doi for articles.
Will require a schema change and reindex.
When looking for either Journals or articles contained within a journal only ISSN can be used, however there are journals lacking ISSNs. Within the system those without ISSNs must have a DOI, though there are some older ones that have neither, which we should ignore. To find the ones without an ISSN we should implement both a journals route and as a container-doi for articles. Will require a schema change and reindex.