On the normal systems of differential equations
Portugaliae mathematica, Tome 33 (1974) no. 4, pp. 199-201
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MR ZblBreves Filho, J.A. On the normal systems of differential equations. Portugaliae mathematica, Tome 33 (1974) no. 4, pp. 199-201. http://geodesic.mathdoc.fr/item/PORMA_1974__33_4_115239/
@article{PORMA_1974__33_4_115239,
author = {Breves Filho, J.A.},
title = {On the normal systems of differential equations},
journal = {Portugaliae mathematica},
pages = {199--201},
year = {1974},
volume = {33},
number = {4},
mrnumber = {0369782},
zbl = {0305.34012},
language = {en},
url = {http://geodesic.mathdoc.fr/item/PORMA_1974__33_4_115239/}
}