1. Chang, I. Dee, & R. Finn, On the solutions of a class of equations occurring in continuum mechanics. Arch. Rational Mech. and Anal. 7, 388–401 (1961).
2. Duffin, R. J., & W. Noll, On exterior boundary value problems in linear elasticity. Arch. Rational Mech. and Anal. 2, 191–196 (1958).
3. Fichera, G., Linear elliptic equations of higher order in two independent variables and singular integral equations. Proc. of Conf. on Part. Diff. Eqn. and Continuum Mech. Madison, Wisconsin: Univ. of Wisconsin Press 1961.
4. Ladyzhenskaya, O. A., The Mathematical Theory of Viscous Incompressible Flow. New York: Gordon & Breach 1963.
5. Muskhelishvili, N. I., Singular Integral Equations. Groningen: P. Nordhoff 1953.