@article{MZM_1967_1_5_a8,
     author = {G. L. Kramer},
     title = {The equivalence of differential and perturbed-differential operators in the space of analytic functions of several variables in multi-circular regions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {565--574},
     publisher = {mathdoc},
     volume = {1},
     number = {5},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1967_1_5_a8/}
}