@article{DE_1991_27_3_a23,
     author = {E. K. Makarov},
     title = {A remark on sets of nonregularity of almost periodic linear differential systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {539--541},
     publisher = {mathdoc},
     volume = {27},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_3_a23/}
}