1. and , ‘Experience with the patch test for convergence of finite element methods’, in (ed.), Mathematical Foundations of the Finite Element Method, Academic Press, New York 1972, pp. 557-587.
2. The patch test—a condition for assessing FEM convergence
3. and , An Analysis of the Finite Element Method, Prentice-Hall, Englewoods Cliffs, N.J., 1973.
4. A proposed standard set of problems to test finite element accuracy
5. Private communication, 1986.