1. On a measure of nonconvexity and applications;Eisenfeld;Yokohama Math. J.,1976
2. Topologie I, Monografie Matematyczne 20;Kuratowski,1948
3. Measures of Noncompactness in Banach Spaces;Banaś,1980
4. Reflexivity and the sup of linear functionals;James;Israel J. Math.,1972
5. The measure of nonconvexity and the Jung constant;Gulevich;J. Math. Sci.,1996