References
- Kellogg , O. D . 1931 . On the Derivatives of Harmonic Functions on the Boundary . Trans. Amer. Math. Soc. , 33 : 486
- Wolfe , P . 1971 . Some Distribution Solutions of Integral Equations and their Application to Partial Differential Equations . Applicable Analysis , 1 : 123
- Duren , P. L . 1970 . Theory of Hp spaces , New York : Academic Press .