@article{10_4153_CMB_1973_021_8,
     author = {Tupper, B. O. J.},
     title = {A {Divergence-Free} {Antisymmetric} {Tensor}},
     journal = {Canadian mathematical bulletin},
     pages = {111--113},
     year = {1973},
     volume = {16},
     number = {1},
     doi = {10.4153/CMB-1973-021-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1973-021-8/}
}