A note on a paper of Harris concerning the asymptotic approximation to the eigenvalues of $-y"+qy=λy$, with boundary conditions of general form

In this paper, we derive an asymptotic approximation to the eigenvalues of the linear differential equation $-y"(x)+q(x)y(x)=λy(x), x\in (a,b)$ with boundary conditions of general form, when $q$ is a measurable function which has a singularity in $(a,b)$ and which is integrable on subsets of $(a,b)$ which exclude the singularity.

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