@article{RM_1994_49_5_a3,
     author = {O. I. Zavialov},
     title = {Bogolyubov's $R$-operation and the {Bogolyubov--Parasyuk} theorem},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {67--76},
     publisher = {mathdoc},
     volume = {49},
     number = {5},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1994_49_5_a3/}
}