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

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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 $M$. 
@article{TSP_2014_30_30_a10,
     author = {M. D. Lysak},
     title = {Precise estimates of the walk speed of solutions of second-order linear systems},
     journal = {Trudy Seminara im. I.G. Petrovskogo},
     pages = {184--212},
     publisher = {mathdoc},
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     number = {30},
     year = {2014},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TSP_2014_30_30_a10/}
}
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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/