@article{CMA_2015_96_a5,
     author = {V. A. Popov},
     title = {On the extendability of locally defined isometries of a {pseudo-Riemannian} manifold},
     journal = {Contemporary Mathematics and Its Applications},
     pages = {98--101},
     year = {2015},
     volume = {96},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMA_2015_96_a5/}
}