%0 Journal Article
%A P. D. Lamberti
%A L. Provenzano
%T A maximum principle in spectral optimization problems for elliptic operators subject to mass density perturbations
%J Eurasian mathematical journal
%D 2013
%P 70-83
%V 4
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/EMJ_2013_4_3_a6/
%G en
%F EMJ_2013_4_3_a6