@article{MZM_1977_21_1_a3,
     author = {N. I. Nagnibida and N. P. Oliinyk},
     title = {On the equivalence of differential operators of infinite order in analytic spaces},
     journal = {Matemati\v{c}eskie zametki},
     pages = {33--39},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_21_1_a3/}
}