@article{TMF_1974_21_3_a3,
     author = {O. I. Zavialov},
     title = {Comments on the structure of the $R$-operation},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {322--328},
     publisher = {mathdoc},
     volume = {21},
     number = {3},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1974_21_3_a3/}
}