@article{1103036313,
author = {London, David},
title = {On the zeros of the solutions of $w^{\prime\prime}(z)+p(z)w(z)=0$.},
journal = {Pacific J. Math.},
volume = {12},
number = {4},
year = {1962},
pages = { 979-991},
language = {en},
url = {http://dml.mathdoc.fr/item/1103036313}
}
London, David. On the zeros of the solutions of $w^{\prime\prime}(z)+p(z)w(z)=0$.. Pacific J. Math., Tome 12 (1962) no. 4, pp. 979-991. http://gdmltest.u-ga.fr/item/1103036313/