TY  - JOUR
AU  - Hamel, François
AU  - Nadirashvili, Nikolai
AU  - Russ, Emmanuel
TI  - Some isoperimetric problems for the principal eigenvalues of second-order elliptic operators in divergence form
JO  - Comptes Rendus. Mathématique
PY  - 2007
SP  - 169
EP  - 174
VL  - 344
IS  - 3
PB  - Elsevier
UR  - http://www.numdam.org/articles/10.1016/j.crma.2006.11.025/
DO  - 10.1016/j.crma.2006.11.025
LA  - en
ID  - CRMATH_2007__344_3_169_0
ER  -