%0 Journal Article
%A Derzko, N. A.
%T Gentle Perturbations of with Application to
%J Canadian journal of mathematics
%D 1970
%P 1055-1070
%V 22
%N 5
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-122-7/
%R 10.4153/CJM-1970-122-7
%F 10_4153_CJM_1970_122_7