%0 Journal Article %A S. Rolewicz %T On ∆-uniform convexity and drop property %J Studia Mathematica %D 1987 %P 181-191 %V 87 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-87-2-181-191/ %R 10.4064/sm-87-2-181-191 %G en %F 10_4064_sm_87_2_181_191