Fix/citation validation

[20001LastOrder]

Description

Add tests and fixes #306

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• My Pull Request is small and focused on one topic so it can be reviewed easily
• My code follows the style guidelines of this project (make format)
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• I have performed a self-review of my code
• I commented hard-to-understand parts of my code
• I updated the documentation (docstrings, /docs)
• My changes generate no new warnings (or explain any new warnings and why they're ok)
• I have added tests that prove my fix is effective or that my feature works
• All tests pass when I run pytest tests (offline mode)

Additional steps for code with networking dependencies:

• I followed the offline and online testing guidelines
• All tests pass when I run pytest tests --external_api (online mode, making network calls)

💔Thank you!

[saminegash]

LGTM but i couldn't test it locally as my local env is not running.

[saminegash]

Lgtm

[20001LastOrder]

@saminegash Could you approve it if it looks good to you?

[saminegash]

LGTM