@article{1077466402,
author = {Coles, W. J.},
title = {Linear and Riccati systems},
journal = {Duke Math. J.},
volume = {22},
number = {1},
year = {1955},
pages = { 333-338},
language = {en},
url = {http://dml.mathdoc.fr/item/1077466402}
}
Coles, W. J. Linear and Riccati systems. Duke Math. J., Tome 22 (1955) no. 1, pp. 333-338. http://gdmltest.u-ga.fr/item/1077466402/