Comment (by Ian Hinder):

It is old and outdated, but I don’t think that’s a good reason to omit it. I’m not sure what the logic was - maybe we were trying to avoid asking people to cite too many things? I can’t think of a reason not to cite the Kranc paper now. @Erik Schnetter @Peter Diener do you remember any details of this decision?

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2789/citation-suggestion-for-kranc