@article{DE_1970_6_7_a8,
     author = {\`E. A. Tikhonova},
     title = {Similarity and homeomorphism of a perturbed and an unperturbed system with block-triangular matrix},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1221--1229},
     publisher = {mathdoc},
     volume = {6},
     number = {7},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1970_6_7_a8/}
}