1. A. A. Balinsky, W. D. Evans, and R. T. Lewis, The Analysis and Geometry of Hardy’s Inequality (Universitext, Springer, Heidelberg, New York, Dordrecht, London, 2015).
2. H. Rademacher, ‘‘Über partielle und totale Differenzierbarkeit I,’’ Math. Ann. 89, 340–359 (1919).
3. T. S. Motzkin, ‘‘Sur quelques propriétés charactéristiques des ensembles convexes,’’ Atti Real. Accad. Naz. Lincei Rend. Cl. Sci. Fis. Mat. Natur., Ser. VI 21, 562–567 (1935).
4. C. Bandle and M. Flucher, ‘‘Table of inequalities in elliptic boundary value problems,’’ in emphRecent Progress in Inequalities, Ed. by V. Milovanovic (Kluwer Academic, Dordrecht, 1998), pp. 97–125.
5. E. B. Davies, ‘‘A Review of Hardy inequalities,’’ in The Maz’ya Anniversary Collection, Vol. 2: Rostock Conference on Functional Analysis, Partial Differential Equations and Applications, Vol. 110 of Operator Theory: Advances and Applications (Birkhäuser, Boston, 1999), pp. 55–67.