- fix issue reported #1809
- filter out `None` value from issn and isbn list
- add comments (from publicationName)
- add publisher
Closes: https://github.com/searxng/searxng/issues/1809
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>
Springer Nature is a global publisher dedicated to providing service to research
community [1] with official API [2].
To test this PR, first get your API key following this page:
https://dev.springernature.com/signup
In searx/engines/springer.py at line 24, add this API key. I left my own key,
commented out in the line aboce. Feel free to use it, if needed.
[1] https://www.springernature.com/
[2] https://dev.springernature.com/