Sufficient conditions for a two-weight norm inequality for potential type integral operators to hold are given in the case p > q > 0 and p > 1 in terms of the Hedberg-Wolff potential.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-sm216-1-1, author = {Hitoshi Tanaka}, title = {Two-weight norm inequalities for potential type integral operators in the case p > q > 0 and p > 1}, journal = {Studia Mathematica}, volume = {215}, year = {2013}, pages = {1-15}, zbl = {1280.42020}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-sm216-1-1} }
Hitoshi Tanaka. Two-weight norm inequalities for potential type integral operators in the case p > q > 0 and p > 1. Studia Mathematica, Tome 215 (2013) pp. 1-15. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-sm216-1-1/