%0 Journal Article
%A Yafaev, D. R.
%T On the scattering matrix for perturbations of constant sign
%J Annales de l'I.H.P. Physique théorique
%D 1992
%P 361-384
%V 57
%N 4
%I Gauthier-Villars
%U http://archive.numdam.org/item/AIHPA_1992__57_4_361_0/
%G en
%F AIHPA_1992__57_4_361_0