@article{CRMATH_2004__338_5_391_0,
     author = {Philippe G. Ciarlet and Cristinel Mardare},
     title = {Extension of a {Riemannian} metric with vanishing curvature},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {391--396},
     publisher = {Elsevier},
     volume = {338},
     number = {5},
     year = {2004},
     doi = {10.1016/j.crma.2003.12.017},
     language = {en},
}