%0 Journal Article %A Bruckner, A. M. %A Leonard, John L. %T On Differentiable Functions having an Everywhere Dense set of Intervals of Constancy %J Canadian mathematical bulletin %D 1965 %P 73-76 %V 8 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1965-009-1/ %R 10.4153/CMB-1965-009-1 %F 10_4153_CMB_1965_009_1