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3. A characterization of a two-weight norm inequality for maximal operators;Sawyer, Eric T.;Studia Math.,1982
4. R. Hunt, D. Kurtz and C. Neugebauer, A note on the equivalence of 𝐴_{𝑝} and Sawyer’s condition for equal weights (to appear).
5. M. Christ, Weighted norm inequalities and Schur’s lemma (preprint).