# Data issues specifically in Citation Graph

## Occurence Download

* date: 2021-10-28
* status: open
* example: https://fatcat.wiki/release/ns4v2jvhgbhh7mbg45bjtpzway/refs-in

Symptom: Many datasets pointing to a publication; e.g. all having "Occurrence Download" as title

Possible mitigation:

* [ ] extract all titles from fatcat
* [ ] find most common titles, decide if it should be blacklisted for citation graph
* [ ] keep blacklist of release ident to ignore in edges
* [ ] filter refcat, remove edges with blacklisted id as source (and target)

## Repeated entries

* date: 2021-04-19
* status: solved
* example: https://fatcat.wiki/release/lcarb5rg5vf3tk4hpvosja5sm4/refs-out

A DOI seems to be using the key, which leads to repeated entries.

> 2021-07-02: Solved, kind of. We get rid of various duplicates in a
> post-processing step. It would still be better to not generate these in the
> first place.

## Self references

* date: 2021-04-19
* status: solved
* example: https://fatcat.wiki/release/3fcp4pk7nfamvkbjekqam24bfq/refs-out

The source and target seem to be the same.

> 2021-07-02: Solved in post-processing, for now.

## Duplicated Edges

* date: 2021-04-20
* status: solved
* example: https://fatcat.wiki/release/22222736evcc7kdn3bleua3fge/refs-out
* found 16/1M

Source and target are the same, maybe DOI with ref key?

> 2021-07-02: Solved in post-processing, for now.