@article{10_4064_cm_62_2_283_292,
     author = {W. Roter},
     title = {Some indefinite metrics and covariant derivatives of their curvature tensors},
     journal = {Colloquium Mathematicum},
     pages = {283--292},
     publisher = {mathdoc},
     volume = {62},
     number = {2},
     year = {1991},
     doi = {10.4064/cm-62-2-283-292},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-62-2-283-292/}
}