%0 Journal Article %A Steven H. Weintraub %A Klaus Hulek %T The principal degenerations of abelian surfaces and their polarisations. %J Mathematische Annalen %D 1990 %P 281-308 %V 286 %N 1-3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1990__286_1-3_164639/ %F MAN_1990__286_1-3_164639