Geodesic
A polar coordinate transformation for nonhomogeneous differential systems
Portugaliae mathematica, Tome 34 (1975) no. 4, pp. 219-223.

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     author = {Tefteller, S.C.},
     title = {A polar coordinate transformation for nonhomogeneous differential systems},
     journal = {Portugaliae mathematica},
     pages = {219--223},
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     volume = {34},
     number = {4},
     year = {1975},
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     zbl = {0346.34020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1975__34_4_115267/}
}
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Tefteller, S.C. A polar coordinate transformation for nonhomogeneous differential systems. Portugaliae mathematica, Tome 34 (1975) no. 4, pp. 219-223. http://geodesic.mathdoc.fr/item/PORMA_1975__34_4_115267/