@article{DAN_1967_176_4_a18,
     author = {N. V. Mitskevich and Jos\'e D. Mujica},
     title = {Chronometric invariance and the problem of gravitational energy},
     journal = {Doklady Akademii Nauk},
     pages = {809--811},
     publisher = {mathdoc},
     volume = {176},
     number = {4},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_176_4_a18/}
}