%0 Journal Article
%A Ernesto, C.
%A  Lindgren, S.
%T Homological transformations in four-dimensional space.
%J Gaceta matemática
%D 1974
%P 77-91
%V 26
%N 3-4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/GAMA_1974_1974_1_a10/
%G en
%F GAMA_1974_1974_1_a10