1. W.Thompson, (Lord Kelvin), Note on the integration of the equations of equilibrium of an elastic solid. Cambridge and Dublin Mathematical Journal 1 (1848) 97?99.
2. J.Boussinesq, Applications des potentials à l'étude de l'équilibre et du mouvvment des solids élastiques, Gaythier-Villars, Paris, (1885).
3. V.Cerruti, In A.E.H.Love (ed.), A Treatise on the Mathematical Theory of Elasticity. Fourth edition. Dover Publications, New York (1882) 16 pp.
4. R.D.Mindlin, Force at a point in the interior of a semi-infinite halfspace. Journal of Applied Physics 79 (1936) 195?202.
5. L.Rongved, Force interior to one or two joined semi-infinite solids. In Proc. Sec. Midwest. Conf. Solid Mech. Lafayette, Indiana, Purdue University (1955) pp. 1?13.