@article{DAN_1963_153_3_a17,
     author = {K. P. Stanyukovich},
     title = {Variation principle in general relativity},
     journal = {Doklady Akademii Nauk},
     pages = {562--565},
     publisher = {mathdoc},
     volume = {153},
     number = {3},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_153_3_a17/}
}