@article{DE_1999_35_12_a4,
     author = {Yu. N. Orlov and V. M. Suslin},
     title = {Trajectories on a sphere that are generated by {Lagrangians} with higher-order derivatives},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1624--1629},
     publisher = {mathdoc},
     volume = {35},
     number = {12},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1999_35_12_a4/}
}