%0 Journal Article
%A Gião, António
%T On the origin of positive and negative electricity
%J Portugaliae mathematica
%D 1949
%P 143-153
%V 8
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PORMA_1949__8_4_114681/
%G en
%F PORMA_1949__8_4_114681