%0 Journal Article %A Everitt, William Norrie %T On the transformation theory of ordinary second-order linear symmetric differential expressions %J Czechoslovak Mathematical Journal %D 1982 %P 275-306 %V 32 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1982.101802/ %R 10.21136/CMJ.1982.101802 %G en %F 10_21136_CMJ_1982_101802