@article{DE_1967_3_11_a10,
     author = {V. K. Romanko},
     title = {On the theory of operators of the form $\frac{d^m}{dt^m}-A$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1957--1970},
     publisher = {mathdoc},
     volume = {3},
     number = {11},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_11_a10/}
}