Geodesic
Spectrum of wandering rates of a nonorthogonal product of two rotations
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (2015), pp. 49-53

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It is proved that wandering rates of solutions to any autonomous four-dimensional system with the Cauchy operator performing two independent rotations with two different frequencies in two planes (forming a direct sum, but not necessarily orthogonal one) fill exactly the segment with endpoints at those frequencies. 
@article{VMUMM_2015_2_a9,
     author = {D. S. Burlakov},
     title = {Spectrum of wandering rates of a nonorthogonal product of two rotations},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {49--53},
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     number = {2},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2015_2_a9/}
}
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D. S. Burlakov. Spectrum of wandering rates of a nonorthogonal product of two rotations. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 2 (2015), pp. 49-53. http://geodesic.mathdoc.fr/item/VMUMM_2015_2_a9/