Geodesic
Spectra of total and vector frequencies of third-order linear differential equations
Trudy Seminara im. I.G. Petrovskogo, Trudy Seminara imeni I. G. Petrovskogo, Tome 30 (2014) no. 30, pp. 252-269 
A. Kh. Stash. Spectra of total and vector frequencies of third-order linear differential equations. Trudy Seminara im. I.G. Petrovskogo, Trudy Seminara imeni I. G. Petrovskogo, Tome 30 (2014) no. 30, pp. 252-269. http://geodesic.mathdoc.fr/item/TSP_2014_30_30_a14/
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

For any positive integer $N$, we construct a linear third-order differential equation with periodic coefficients whose nontrivial solutions have at least $N$ different total (vector) frequencies. Moreover, we construct a linear third-order differential equation with bounded variable coefficients whose nontrivial solutions have countably many total (vector) frequencies.

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