@article{SM_1971_15_2_a8,
     author = {Yu. A. Aminov},
     title = {An energy condition for the existence of a~rotation},
     journal = {Sbornik. Mathematics},
     pages = {325--334},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {1971},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1971_15_2_a8/}
}