%0 Journal Article %A Shapiro, Harold S. %T A Class of Singular Functions %J Canadian journal of mathematics %D 1968 %P 1425-1431 %V 20 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-143-9/ %R 10.4153/CJM-1968-143-9 %F 10_4153_CJM_1968_143_9