Geodesic
On the normal systems of differential equations
Portugaliae mathematica, Tome 33 (1974) no. 4, pp. 199-201.

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     author = {Breves Filho, J.A.},
     title = {On the normal systems of differential equations},
     journal = {Portugaliae mathematica},
     pages = {199--201},
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     volume = {33},
     number = {4},
     year = {1974},
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     zbl = {0305.34012},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/PORMA_1974__33_4_115239/}
}
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Breves Filho, J.A. On the normal systems of differential equations. Portugaliae mathematica, Tome 33 (1974) no. 4, pp. 199-201. https://geodesic-test.mathdoc.fr/item/PORMA_1974__33_4_115239/