%0 Journal Article
%A Chicco, M.
%A Lancia, M. R.
%T Generalized maximum principle and evaluation of the first eigenvalue for Heisenberg-type operators with discontinuous coefficients
%J Bollettino della Unione matematica italiana
%D 2001
%P 441-456
%V 4B
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/BUMI_2001_8_4B_2_a8/
%G en
%F BUMI_2001_8_4B_2_a8