Singular exponents and properness criteria for linear differential systems

[11] LYAPUNOV AM, 1956, SOBR SOCH, V2

[12] Millionshchikov V. M., 1969, SIB MAT ZH, V10, P99

[13] The order numbers of linear differential equation systems. [J]. MATHEMATISCHE ZEITSCHRIFT, 1930, 31 : 748 - 766

[14] Vinograd R. E., 1954, USP MAT NAUK, V9, P129

[11] LYAPUNOV AM, 1956, SOBR SOCH, V2

[12] Millionshchikov V. M., 1969, SIB MAT ZH, V10, P99

[13] The order numbers of linear differential equation systems. [J]. MATHEMATISCHE ZEITSCHRIFT, 1930, 31 : 748 - 766

[14] Vinograd R. E., 1954, USP MAT NAUK, V9, P129