†This paper is a short form of the author's doctoral thesis, TH Darmstadt, D 17, Germany.
‡In memory of Professor Stefan Bergman, one of the founders of modern function theoretic methods in partial differential equations.
Notes
†This paper is a short form of the author's doctoral thesis, TH Darmstadt, D 17, Germany.
‡In memory of Professor Stefan Bergman, one of the founders of modern function theoretic methods in partial differential equations.