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WikiPedia: Zentralblatt MATH http://www.emis.de/MATH/JFM/full.html http://www.ams.org/samplings/math-history/hmath1-l... http://www.zbmath.org/ http://www.zentralblatt-math.org/zmath/en/ https://web.archive.org/web/20130723060131/http://...