Linear Pfaff systems with the lower characteristic vectors' set of positive Lebesgue measure. Izobov, N. — 1998 Memoirs on Differential Equations and Mathematical Physics
Estimates of the lower exponent of a two-dimensional linear system under Perron perturbations. Izobov, N. — 1997 Memoirs on Differential Equations and Mathematical Physics
On the enumerable set of different characteristic sets of solutions of a Pfaffian linear system. Izobov, N. — 1998 Memoirs on Differential Equations and Mathematical Physics
On the existence of a measure unbounded exponential spectral characteristic set of a linear system with a small parameter at the derivative. Izobov, N.; Krasovskij, S. — 1998 Memoirs on Differential Equations and Mathematical Physics