Could you remove spaces before colons in titles and update tests?

Can we clean this? I'm not even sure how Zotero would end up parsing this date (though I think just as 2000?).

No, it is more complicated because here the whole series is meant. So

Erscheinungsverlauf: | 1972/73 - 1999/2000(2001); 2001/02(2003) -

means that there was a report for 1972/1973, ..., and another report for 1999/2000 published in 2001, but no report in 2000/2001 (the note explained why). Then from 2001/2002 in 2003 it started again normally.

How about moving the date in this case to a note? Deleting would be okay also for me, because these report (series) are not my main focus here.

I'd still pick a date to import, maybe the first one? Putting the rest into notes sounds right.

This is as <Mannheim> in the RIS export and then apparently ignored by Zotero. I'm suspecting because that was your search term? I think it's save to just clean pointy brackets from the RIS completely?

This comes from

AU  - Universität <Mannheim>

which is catalogued as a "Körperschaft" in the original. Maybe we could move it to a contributor but I don't know how to identifies these cases. Thoughts?

Sorry, I had seen that but markdown swallowed the relevant bit. I think we should leave it as author, which seems fine to me, but we should filter out the pointy brackets (< >) so that it actually imports as "Universität Mannheim" and not just "Universität "