@article{TM_1971_112_a1,
     author = {N. N. Bogolyubov and V. S. Vladimirov},
     title = {Representations of $n$-point functions},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {5--21},
     publisher = {mathdoc},
     volume = {112},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1971_112_a1/}
}