On the asymptotic relations between the solutions of two systems of ordinary differential equations V. Staikos — 1966 Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
Remarks on a paper of Ph. Hartman concerning the asymptotic behavior of the solution of almost-separable differential equations V. Staikos — 1966 Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
On the asymptotic behavior of solutions of perturbed linear systems of ordinary differential equations V. Staikos — 1967 Δελτίο της Ελληνικής Μαθηματικής Εταιρίας