1. Lectures on Exponential Decay of Solutions of Second-Order Elliptic Equations;Agmon,1982
2. Sharp constants in Hardy type inequalities;Avkhadiev;Izv. Vysš. Učebn. Zaved., Mat.,2015
3. The Analysis and Geometry of Hardy's Inequality;Balinsky,2015
4. Dirichlet Forms and Analysis on Wiener Space;Bouleau,1991
5. Boman equals John;Buckley,1996