ananyo writes: Thomson Reuters has uncovered a Brazilian self-citation cartel in which editors of journals cited each other to boost their impact factors. The cartel grew out of frustration with the system for evaluating graduate programs, which places too much emphasis on publishing in 'top tier' journals, one of the editors claims. As emerging Brazilian journals are in the lowest ranks, few graduates want to publish in them. This vicious cycle, in his view, prevents local journals improving. Both the Brazilian education ministry and Thomson Reuters have censured the journals. The ministry says articles from the journals published in 2012-12 will not count in any future assessment, and Thomson Reuters has suspended their impact factors.