@article{TMF_1999_120_2_a6,
     author = {B. L. Voronov and I. V. Tyutin and Sh. S. Shakhverdiev},
     title = {Local variational differential operators in field theory},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {256--276},
     year = {1999},
     volume = {120},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1999_120_2_a6/}
}