1. Akin, J.E., Application and Implementation of Finite Element Methods. Academic Press, London, 1982.
2. Fichera, G., Asymptotic behaviour of the electric field and density of the electric charge in the neighbourhood of singular points of a conducting surface. Russian Math. Surveys 30, 107–127, 1975.
3. Harrison, D., Ward, T.J.W. and Whiteman, J.R., Proc. 4th Int. Seminar on Finite Element Systems. Computational Mechanics Centre, Southampton, July 1983.
4. Grisvard, P., Behaviour of the solutions of an elliptic boundary value problem in a polygonal or polyhedral domain. pp. 207–274 of B. Hubbard (ed.), Numerical Solution of Partial Differential Equations III, SYNSPADE 1975. Academic Press, New York, 1976.
5. NAG Routines f01buf, f01bvf, f01bwf, f02bff and f02sdf, NAG Manual Vol. 4. Numerical Algorithms Group, Oxford.