@article{1102779252, author = {Smith, H. L.}, title = {A note on disconjugacy for second order systems.}, journal = {Pacific J. Math.}, volume = {91}, number = {2}, year = {1980}, pages = { 447-452}, language = {en}, url = {http://dml.mathdoc.fr/item/1102779252} }
Smith, H. L. A note on disconjugacy for second order systems.. Pacific J. Math., Tome 91 (1980) no. 2, pp. 447-452. http://gdmltest.u-ga.fr/item/1102779252/