TY  - JOUR
AU  - Allegretto, Walter
TI  - Lower Bounds on the Number of Points in the Lower Spectrum of Elliptic Operators
JO  - Canadian journal of mathematics
PY  - 1979
SP  - 419
EP  - 426
VL  - 31
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1979-045-0/
DO  - 10.4153/CJM-1979-045-0
ID  - 10_4153_CJM_1979_045_0
ER  -