@article{TM_1975_135_a28,
     author = {Yu. M. Shirokov},
     title = {Covariant expansions for field commutators at an equal-time point},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {228--235},
     publisher = {mathdoc},
     volume = {135},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1975_135_a28/}
}