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@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/} }
N. N. Bogolyubov; V. S. Vladimirov. Representations of $n$-point functions. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Collection of articles. Part I, Tome 112 (1971), pp. 5-21. http://geodesic.mathdoc.fr/item/TM_1971_112_a1/