@article{DE_1992_28_10_a5,
     author = {E. K. Makarov},
     title = {The effect of {Lyapunov} transforms and different perturbations on the nonregularity sets of linear differential systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1708--1715},
     publisher = {mathdoc},
     volume = {28},
     number = {10},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_10_a5/}
}