@article{MS2_1975__36_166405,
     author = {Peter B. Gilkey},
     title = {Local invariants of a {pseudo-Riemannian} manifold.},
     journal = {Mathematica Scandinavica},
     pages = {110--131},
     publisher = {mathdoc},
     volume = {36},
     year = {1975},
     zbl = {0299.53040},
     url = {http://geodesic.mathdoc.fr/item/MS2_1975__36_166405/}
}