Thanks for finding the mummer4 package, Ben.
I don't understand that search string, can't make up what exactly was searched on.
For the record, that link was to papers citing Kurtz 2004 - in scholar's usual unreadable api style.
The https://mummer4.github.io/ homepage cites the 2018 PLOS article as the canonical citation:
https://journals.plos.org/ploscompbiol/article?id=10.1371/journal.pcbi.1005944
This paper suggests two innovations for mummer4 - longer genomes (not directly relevant for covid19) and parallelisation. I would recommend prioritising mummer3 over 4 but ultimately the majority of bioinformaticians will prefer mummer4.
Slainté,
Jim.
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