N. Krupnik: Banach algebras with a symbol and singular integral operators. BirkhŠuser 1987, 200p. DM 106. Solomon Mikhlin/Siegfried Pršssdorf: Singular integral operators. Springer 1986, 530p. 3-540-15967-3. DM 106. G. Vainikko: Multidimensional weakly singular integral equations. SLN Math. 1549 (1993), 160p. DM 42.