@article{DAN_1985_282_4_a15,
     author = {R. Ya. Matsyuk},
     title = {Lagrangian analysis of invariant third-order equations of motion},
     journal = {Doklady Akademii Nauk},
     pages = {841--844},
     publisher = {mathdoc},
     volume = {282},
     number = {4},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_282_4_a15/}
}