%0 Journal Article
%A Carvalho, L.A.V.
%A Ladeira, L.A.C.
%A Martelli, M.
%T Forbidden periods in delay differential equations.
%J Portugaliae mathematica
%D 2000
%P 259-271
%V 57
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PORMA_2000__57_3_48899/
%G en
%F PORMA_2000__57_3_48899