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2. Muskhelishvili, N.I.: Some Basic Problems of Mathematical Elasticity Theory. Noordhoff, Springer (1977). (translated from Russian)
3. Muskhelishvili, N.I.: Singular Integral Equations. Noordhoff, Groningen (1968)
4. Gakhov, F.D.: Boundary Value Problems. Pergamon, Oxford (1966)
5. Vekua, N.P.: Systems of Singular Integral Equations and Some Boundary Value Problems. Noordhoff, Groningen (1967)