%0 Journal Article %A Teresa Crespo %T Central extensions of the alternating group as Galois groups %J Acta Arithmetica %D 1994 %P 229-236 %V 66 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa-66-3-229-236/ %R 10.4064/aa-66-3-229-236 %G en %F 10_4064_aa_66_3_229_236