@article{10_4153_CMB_1975_063_9,
     author = {Gentry, Rodney D.},
     title = {A {Note} on {Upper} {Bounds} for the {Eigenvalues} of y'' + \ensuremath{\lambda}py=0},
     journal = {Canadian mathematical bulletin},
     pages = {347--351},
     year = {1975},
     volume = {18},
     number = {3},
     doi = {10.4153/CMB-1975-063-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-063-9/}
}