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I. E. Vitrychenko

Critical cases of π-stability of a nonautonomous essentially nonlinear equation of order $n$: I. E. Vitrychenko; Volume 6, No.2, pp. 171-177; Link PDF
On global stability of a nonautonomous quasilinear system in a certian critical case: I. E. Vitrychenko; Volume 3, No.3, pp. 323-333; Link
Critical case of global stability of a nonautonomous essentially nonlinear system: I. E. Vitrychenko; Volume 3, No.4, pp. 449-457; Link
On λ-stability of one essentially nonlinear nonautonomous second order equation: I. E. Vitrychenko; Volume 4, No.4, pp. 547-559; Link PDF