1. S.K. Abdullaev and A.A. Babaev, Certain estimates for the singular integral with summable density (Russian). Dokl. Acad. Nauk 188(2) (1969), 263–265.
2. S.K. Abdullaev and A.A. Babaev, On a singular integral with summable density (Russian). Funkts.nyi Anal. Primen., Baku 3 (1978), 3–32.
3. D.R. Adams, A note on Choquet integrals with respect to Hausdorff capacity. In: Function Spaces and Applications (Lund, 1986), Lecture Notes in Math., vol. 1302, pp. 115–124, Springer, Berlin, 1988.
4. D.R. Adams and J. Xiao, Nonlinear potential analysis on Morrey spaces and their capacities. Indiana Univ. Math. J. 53 (2004), no. 6, 1629–1663.
5. D.R. Adams, Lectures on-potential theory. Ume˚a University Reports, no. 2, 1981.