%0 Journal Article
%A Solomon Feferman
%T Two notes on abstract model theory. II. Languages for which, the set of valid sentences is semi-invariantly implicitly definable
%J Fundamenta Mathematicae
%D 1975
%P 111-130
%V 89
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/fm-89-2-111-130/
%R 10.4064/fm-89-2-111-130
%G en
%F 10_4064_fm_89_2_111_130