Geodesic
Precise estimates of the walk speed of solutions of second-order linear systems
Trudy Seminara im. I.G. Petrovskogo, Trudy Seminara imeni I. G. Petrovskogo, Tome 30 (2014) no. 30, pp. 184-212 
M. D. Lysak. Precise estimates of the walk speed of solutions of second-order linear systems. Trudy Seminara im. I.G. Petrovskogo, Trudy Seminara imeni I. G. Petrovskogo, Tome 30 (2014) no. 30, pp. 184-212. http://geodesic.mathdoc.fr/item/TSP_2014_30_30_a10/
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

We consider some classes of nonautonomous second-order systems of differential equations whose coefficients are bounded by a given constant $M$, in particular, diagonal systems, triangular systems, and systems corresponding to a single equation. It is shown that the walk speeds of solutions of various systems from these classes fill up a certain interval, and precise estimates are obtained for the length of that interval in terms of the value of $M$.

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[2] Lysak M. D., “Tochnye otsenki skorosti bluzhdaniya reshenii lineinykh sistem”, Differents. uravneniya, 46:11 (2010), 1670–1671

[3] Lysak M. D., “Tochnye otsenki skorosti bluzhdaniya reshenii lineinykh uravnenii vtorogo poryadka”, Differents. uravneniya, 48:6 (2012), 907