The divergence theorem and Perron integration with exceptional sets Wolfgang B. Jurkat (1993) Czechoslovak Mathematical Journal Similarity:
On overdetermined Hardy inequalities Alois Kufner, Herbert Leinfelder (1998) Mathematica Bohemica Similarity: Necessary and sufficient condition on the weights will be derived under which a k -th order Hardy inequality holds on classes of functions satisfying more than k “boundary” conditions.