Paperfetcher

Key feature improvements:

- Improved error handling: searches continue and display warnings instead of terminating with errors even in cases when user input is incorrect.

Other improvements:

- Examples have been completely re-written.
- Docs have been updated.
- Jupyter notebook apps (which were broken in the previous release) have been removed.

Key feature improvements:

- Added backward and forward reference chasing using COCI.
- Added support for RISDatasets.
- Added Crossref content negotiation to generate RISDatasets from DOIs.

Other improvements:

- Bug fixes.

Known issues:

- Jupyter notebook apps are now broken.

Patch to add support for combining DOIDataset objects.

Key feature improvements:
- Jupyter notebook-based GUI applications for hand-search and snowball-search.

Other improvements:
- Bug fixes
- Additional examples and documentation.

First paperfetcher release to PyPi.