TY  - JOUR
AU  - Clements, John C.
TI  - Enclosure Theorems for Eigenvalues of Elliptic Operators
JO  - Canadian mathematical bulletin
PY  - 1970
SP  - 1
EP  - 7
VL  - 13
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1970-001-8/
DO  - 10.4153/CMB-1970-001-8
ID  - 10_4153_CMB_1970_001_8
ER  -