@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}, pages = {437--449}, publisher = {Elsevier}, volume = {Ser. 4, 13}, number = {4}, year = {1980}, doi = {10.24033/asens.1391}, zbl = {0453.34006}, mrnumber = {82d:34053}, language = {en}, url = {archive.numdam.org/item/ASENS_1980_4_13_4_437_0/} }
Neuman, F. Second order linear differential systems. Annales scientifiques de l'École Normale Supérieure, Série 4, Tome 13 (1980) no. 4, pp. 437-449. doi : 10.24033/asens.1391. http://archive.numdam.org/item/ASENS_1980_4_13_4_437_0/
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