1. The post-processing approach in the finite element method—part 1: Calculation of displacements, stresses and other higher derivatives of the displacements
2. ‘Boundary value problems in non-smooth domains’, Lecture Notes No. 19, Univ. of Maryland, Dept. of Mathematics (1980).
3. and , ‘On the square integrability of the highest derivatives of the solution of the Dirichlet problem on domains with piecewise smooth boundaries’, (in Russian), Izvestija Vyšich Učebnych Zavedenij, Math. 1962, no. 5, pp. 12-21.
4. Numerical Approximation of Elliptic Interface and Corner Problems, Habilitationsschrift, University of Bonn, 1981.
5. ‘A simple and accurate method for the determination of stress intensity factors and solutions for problems on domains with corners’, in The Mathematics of Finite Elements and Applications IV, MAFELAP, 1981 (Ed. ), Academic Press, London, 1982.