The citation black market: schemes selling fake references alarm scientists
Briefly

"We started to notice several Google Scholar profiles with questionable citation trends... When a manuscript acquires hundreds of citations within days of publication, or when a scientist has an abrupt and large rise in citations, you know something is wrong."
"These practices are troublesome because many aspects of a researcher's career depend on how many references their papers garner. Many institutions use citation counts to evaluate scientists, and citation numbers inform metrics such as the h-index."
Read at Nature
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