Dentability, Smoothability and Stronger Properties in Banach Spaces Francis Sullivan Indiana University Mathematics Journal 1977 text pdf 10.1512/iumj.1977.26.26042 10.1512/iumj.1977.26.26042 en Indiana Univ. Math. J. 26 (1977) 545 - 553 state-of-the-art mathematics http://iumj.org/access/