%0 Journal Article
%A James C. Lillo
%T The functional equation $f^2(x) = g(x)$
%J Annales Polonici Mathematici
%D 1967
%P 123-135
%V 19
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/ap-19-2-123-135/
%R 10.4064/ap-19-2-123-135
%G en
%F 10_4064_ap_19_2_123_135