@article{JRAM_1993__441_153545,
     author = {Andrew Swann and Henrik Pedersen},
     title = {Einstein-Weyl geometry, the {Bach} tensor and conformal scalar curvature.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {99--114},
     publisher = {mathdoc},
     volume = {441},
     year = {1993},
     zbl = {0776.53027},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1993__441_153545/}
}