%0 Journal Article
%A Mazhar, S.M.
%A Al-Budaiwi, Aisha
%T A note on a Theorem of Ermakov
%J Portugaliae mathematica
%D 1987
%P 213-219
%V 44
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PORMA_1987__44_2_115582/
%G en
%F PORMA_1987__44_2_115582