%0 Journal Article
%A Stephen Watson
%A Zhou Hao-Xuan
%T Caliber ($ω_1$, ω) is not productive
%J Fundamenta Mathematicae
%D 1990
%P 1-4
%V 135
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/fm-135-1-1-4/
%R 10.4064/fm-135-1-1-4
%G en
%F 10_4064_fm_135_1_1_4