Perhaps not a real problem, but it should perhaps be investigated.
Number of publications for primary_location.source.id:S2764766162: 3
Number of publications for primary_location.source.id:S151808461: 947
Another 10850 articles found
<string>:50: FutureWarning: The behavior of DataFrame concatenation with empty or all-NA entries is deprecated. In a future version, this will no longer exclude empty or all-NA columns when determining the result dtypes. To retain the old behavior, exclude the relevant entries before the concat operation.
Number of publications for primary_location.source.id:S178739765: 0
Number of publications for primary_location.source.id:S4210199753: 0
Perhaps not a real problem, but it should perhaps be investigated.