As from March 1st 2007, all records of articles online in CEDRAM exist in two formats, which are only different by the way they display mathematical formulae in titles, abstracts, keywords or references, : MathML or TeX.XHTML+MathML display is the one which seems the best for reading and browsing thanks to the significant progress in recent browsers based on the Gecko engine, once they are properly configured.The HTML+TeX version is proposed for compatibility for users who do not yet have an environment capable of displaying MathML: we encourage them to update their browser ! (With MathML formulae are totally integrated in the text. Therefore they adapt themselves to local preferences : font, size, zoom, contrast, etc.).