The BMJ requires copies of any previous work with more than 10% overlap of a submission before approving a work for publication.
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While the rule has always been present it was formalized by Franz J. Ingelfinger editor of the The New England Journal of Medicine who coined the Ingelfinger rule banning republications in his journal.
Duplicate Scrabble | Scholastic (Notre Dame publication) | Quartz (publication) | Publication bias | Open Publication License | Laws of Duplicate Bridge | Harpers Magazine (trade publication) | ''General Jail Delivery'', satirical engraving of the time of Lovell's first imprisonment; the publication ''The Statesman'' is shown held (back to the left) by a man talking to a barrister; towards the front William Cobbett | Flora (publication) | Duplicate bridge | Committee on Publication Ethics | American Baptist Publication Society building |