%0 Journal Article %A Graf, Patrick %A Kovács, Sándor J. %T An optimal extension theorem for 1-forms and the Lipman-Zariski conjecture %J Documenta mathematica %D 2014 %P 815-830 %V 19 %I mathdoc %U http://geodesic.mathdoc.fr/item/DOCMA_2014__19__a18/ %G en %F DOCMA_2014__19__a18