%0 Journal Article
%T Circle bundles over 4-manifolds
%A Haibao Duan
%A Chao Liang
%J Mathematics
%D 2005
%I arXiv
%X Every 1-connected topological 4-manifold M admits a $S^{1}$-covering by $#_{r-1}S^{2}\times S^{3}$, where $r=$rank$H^{2}(M;\QTR{Bbb}{Z})$.
%U http://arxiv.org/abs/math/0502469v1