@article{DAN_1985_285_2_a15,
     author = {R. Ya. Matsyuk},
     title = {Lagrangian analysis of invariant third-order equations of motion},
     journal = {Doklady Akademii Nauk},
     pages = {327--330},
     publisher = {mathdoc},
     volume = {285},
     number = {2},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_285_2_a15/}
}