%0 Journal Article %A Stewart, James %T Unbounded Positive Definite Functions %J Canadian journal of mathematics %D 1969 %P 1309-1318 %V 21 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1969-143-4/ %R 10.4153/CJM-1969-143-4 %F 10_4153_CJM_1969_143_4