%0 Journal Article
%A Clements, John C.
%T Enclosure Theorems for Eigenvalues of Elliptic Operators
%J Canadian mathematical bulletin
%D 1970
%P 1-7
%V 13
%N 1
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1970-001-8/
%R 10.4153/CMB-1970-001-8
%F 10_4153_CMB_1970_001_8