%0 Journal Article
%A Sigbjorn Halvorsen
%T On the Quadratic Integrability of Solutions of d2x/dt2 + f(t)x = 0.
%J Mathematica Scandinavica
%D 1964
%P 111-119
%V 14
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MS2_1964__14_165873/
%F MS2_1964__14_165873