Some conditions for the existence of two periodic integrals of the homogeneous linear differential equation of the seoond order
Mathematische Zeitschrift, Tome 36 (1933), pp. 195-201.

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@article{MZ_1933__36_168396,
     author = {Underwood. F.},
     title = {Some conditions for the existence of two periodic integrals of the homogeneous linear differential equation of the seoond order},
     journal = {Mathematische Zeitschrift},
     pages = {195--201},
     publisher = {mathdoc},
     volume = {36},
     year = {1933},
     zbl = {58.0457.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1933__36_168396/}
}
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Underwood. F. Some conditions for the existence of two periodic integrals of the homogeneous linear differential equation of the seoond order. Mathematische Zeitschrift, Tome 36 (1933), pp. 195-201. http://geodesic.mathdoc.fr/item/MZ_1933__36_168396/