@article{10_4064_cm87_2_8,
     author = {Neculai Papaghiuc},
     title = {A {Ricci} flat {pseudo-Riemannian} metric
on the tangent bundle of a {Riemannian} manifold},
     journal = {Colloquium Mathematicum},
     pages = {227--233},
     publisher = {mathdoc},
     volume = {87},
     number = {2},
     year = {2001},
     doi = {10.4064/cm87-2-8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm87-2-8/}
}