%0 Journal Article
%A Bush, Michael
%A Frymark, Dale
%A Liaw, Constanze
%T Singular boundary conditions for Sturm–Liouville operators via perturbation theory
%J Canadian journal of mathematics
%D 2023
%P 1110-1146
%V 75
%N 4
%U http://geodesic.mathdoc.fr/articles/10.4153/S0008414X22000293/
%R 10.4153/S0008414X22000293
%F 10_4153_S0008414X22000293