TY  - JOUR
AU  - Chicco, M.
AU  - Lancia, M. R.
TI  - Generalized maximum principle and evaluation of the first eigenvalue for Heisenberg-type operators with discontinuous coefficients
JO  - Bollettino della Unione matematica italiana
PY  - 2001
SP  - 441
EP  - 456
VL  - 4B
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/BUMI_2001_8_4B_2_a8/
LA  - en
ID  - BUMI_2001_8_4B_2_a8
ER  -