%0 Journal Article %A Sergio Fratarcangeli %T A first-order version of Pfaffian closure %J Fundamenta Mathematicae %D 2008 %P 229-254 %V 198 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm198-3-3/ %R 10.4064/fm198-3-3 %G en %F 10_4064_fm198_3_3