%0 Journal Article %A Tupper, B. O. J. %T A Divergence-Free Antisymmetric Tensor %J Canadian mathematical bulletin %D 1973 %P 111-113 %V 16 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1973-021-8/ %R 10.4153/CMB-1973-021-8 %F 10_4153_CMB_1973_021_8