The expression return App\Citation::sel...id', '=', 'sources.id') could return the type Illuminate\Database\Query\Builder which is incompatible with the type-hinted return Illuminate\Database\Eloquent\Builder. Consider adding an additional type-check to rule them out.
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citations.id as "dtRowId", citations.name as name, citations.description as description, citations.volume as volume,
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citations.page as page, citations.confidence as confidence, citations.is_active as is_active,
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citations.date as date, citations.created_at as created_at, sources.name as source