@article{ASENS_1980_4_13_4_437_0, author = {Neuman, F.}, title = {Second order linear differential systems}, journal = {Annales scientifiques de l'\'Ecole Normale Sup\'erieure}, volume = {13}, year = {1980}, pages = {437-449}, doi = {10.24033/asens.1391}, mrnumber = {82d:34053}, zbl = {0453.34006}, language = {en}, url = {http://dml.mathdoc.fr/item/ASENS_1980_4_13_4_437_0} }
Neuman, F. Second order linear differential systems. Annales scientifiques de l'École Normale Supérieure, Tome 13 (1980) pp. 437-449. doi : 10.24033/asens.1391. http://gdmltest.u-ga.fr/item/ASENS_1980_4_13_4_437_0/
[1] Manifolds All of Whose Geodesics are Closed (Ergebnisse, Vol. 93, Springer, Berlin, New York, 1978). | MR 80c:53044 | Zbl 0387.53010
,[2] Disconjugacy (Lecture Notes in Mathematics, Vol. 220, Springer, Berlin, New York, 1971). | MR 57 #778 | Zbl 0224.34003
,[3] A Theorem of Hopf (Michigan Math. J., Vol. 5, 1958, pp. 31-34). | MR 20 #4300 | Zbl 0134.39601
,[4] Differential Geometry, Dover Publ., Inc., New York, 1977. | MR 58 #12737 | Zbl 0357.53002
,[5] Linear Differential Equations of the Second Order and Their Applications (Rend. Math., Vol. 4, 1971, pp. 559-617). | MR 47 #534 | Zbl 0227.34005
,