Conjugacy and disconjugacy criteria are established for the equation \[ u^{\prime \prime }+p(t)u=0\,, \] where $p:]-\infty ,+\infty [\rightarrow ]-\infty ,+\infty [$ is a locally summable function.
@article{107746, author = {T. Chantladze and Alexander Lomtatidze and Douglas Ugulava}, title = {Conjugacy and disconjugacy criteria for second order linear ordinary differential equations}, journal = {Archivum Mathematicum}, volume = {036}, year = {2000}, pages = {313-323}, zbl = {1054.34053}, mrnumber = {1811176}, language = {en}, url = {http://dml.mathdoc.fr/item/107746} }
Chantladze, T.; Lomtatidze, Alexander; Ugulava, Douglas. Conjugacy and disconjugacy criteria for second order linear ordinary differential equations. Archivum Mathematicum, Tome 036 (2000) pp. 313-323. http://gdmltest.u-ga.fr/item/107746/
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