@article{ZVMMF_1979_19_6_a3,
     author = {V. I. Tsurkov},
     title = {Decomposition in classical variational calculus},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1396--1413},
     year = {1979},
     volume = {19},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1979_19_6_a3/}
}