[1] N. Bourbaki: Integration. (Russian), Nauka, Moskva 1967. MR 0223524 | Zbl 0156.06001

[2] M. Dont: Non-tangential limits of the double layer potentials. Časopis pěst. mat. 97 (1972), 231-258. MR 0444975 | Zbl 0237.31012

[3] J. L. Doob: Classical potential theory and its probabilistic counterpart. Springer-Verlag, Berlin 1984. MR 0731258 | Zbl 0549.31001

[4] J. Král: Integral operators in potential theory. Lecture Notes in Math. 823. Springer-Verlag, Berlin 1980. MR 0590244

[5] J. Král: The Fredholm method in potential theory. Trans. Amer. Math. Soc. 125 (1966), 511-547. MR 0209503

[6] J. Král: On the logarithmic potential of the double distribution. Czechoslovak Math. J. 14 (89) 1964, 306-321. MR 0180690

[7] J. Král: The Fredholm radius of an operator in potential theory. Czechoslovak Math. J. 15(90) 1965, 565-588. MR 0190363

[8] J. Král: Potentials and boundary value problems. 5. Tagung über Probleme und Methoden der Math. Physik, Wiss. Schriftenreihe der TH Karl-Marx-Stadt 1975, Hft. 3, 484-500. MR 0430272

[9] J. Král: Theory of potential I. (Czech). Stát. pedag. nakl. Praha, Praha 1965.

[10] J. Král I. Netuka J. Veselý: Theory of potential II. (Czech). Stát. pedag. nak. Praha 1972.

[11] J. Mařík: Note on the length of the Jordan curve. (Czech). Časopis pěst. mat. 83 (1958), 91-96.

[12] J. Radon: Über Randwertaufgaben beim logarithmischen Potential. Sitzber. Akad. Wiss. Wien 128 (1919), 1123-1167.