@article{TMF_1972_11_3_a0,
     author = {M. K. Volkov},
     title = {Nonpolynomial {Lagrangians} (higher perturbation orders)},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {273--287},
     publisher = {mathdoc},
     volume = {11},
     number = {3},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1972_11_3_a0/}
}