[AKK1] T. S. Angell R. E. Kleinman J. Král: Double layer potentials on boundaries with corners and edges. Comment. Math. Univ. Carolinae 27 (1989). MR 0981880

[AKK2] T. S. Angell R. E. Kleinman J. Král: Layer potentials on boundaries with corners and edges. Časopis pěst. mat. 113 (1988), 387-402. MR 0981880

[DG1] E. De Giorgi: Su una teoria generále della misura (r - l)-dimensionale in uno spazi ad r dimensioni. Annali di Mat. Pura ed Appl. Ser. 4, 36 (1954), 191 - 213. MR 0062214

[DG2] E. De Giorgi: Nuovi teoremi relativi alle misure (r - l)-dimensionali in uno spazi ad r dimensioni. Ricerche Mat. 4 (1955), 95-113. MR 0074499

[Do] M. Dont E. Dontová: Invariance of the Fredholm radius of an operator in potential theory. Časopis pěst. mat. 112 (1987), 269-283. MR 0905974

[Fe1] H. Federer: A note on the Gauss-Green theorem. Proc. Amer. Math. Soc. 9 (1958), 447-451. MR 0095245 | Zbl 0087.27302

[Fe2] H. Federer: Geometric measure theory. Springer-Verlag 1969. MR 0257325 | Zbl 0176.00801

[Fe3] H. Federer: The Gauss-Green theorem. Trans. Amer. Math. Soc. 58 (1945), 44-76. MR 0013786 | Zbl 0060.14102

[K1] J. Král: Integral Operators in Potential Theory. Lecture Notes in Mathematics 823, Springer-Verlag, Berlin 1980. MR 0590244

[K2] J. Král: Flows of heat and the Fourier problem. Czechoslovak Math. J. 20 (95) (1970), 556-597. MR 0271554

[K3] J. Král: Note on sets whose characteristic functions have signed measure for their partial derivatives. (Czech). Časopis pěst. mat. 86 (1961), 178-194. MR 0136697

[K4] J. Král: The Fredholm method in potential theory. Trans. Amer. Math. Soc. 125 (1966), 511-547. MR 0209503

[K5] J. Král: The Fredholm radius of an operator in potential theory. Czechoslovak Math. J. 15 (90) (1965), 565-588. MR 0190363

[KW] J. Král W. Wendland: Some examples concerning applicability of the Fredholm-Radon method in potential theory. Aplikace Matematiky 31 (1986), 293 - 308. MR 0854323

[O] M. Ohtsuka: Reading of De Giorgi's papers. Gakushuin University 1980.