%0 Journal Article
%A I.I, Jr. Hirschman
%T Variation Diminishing Transformations and STURM-LIOUVILLE Systems.
%J Commentarii mathematici Helvetici
%D 1961
%P 214-233
%V 36
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1961__36_139236/
%F CMH_1961__36_139236