%0 Journal Article
%A Arto Salomaa
%T On essential variables of functions, especially in the algebra of logic
%J Annales Fennici Mathematici
%D 1964
%V 336-344
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1964.339/
%R 10.5186/aasfm.1964.339
%G en
%F AFM_1964_336-344_a5