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2. I. BABUŠKA & A. K. AZIZ, "Survey lectures on the mathematical foundations of the finite element method," The Mathematical Foundations of the Finite Element Method with Applications to Partial Differential Equations (A. K. Aziz, Editor), Academic Press, New York, 1973, pp. 5-359.
3. Mixed-hybrid finite element approximations of second-order elliptic boundary-value problems;Babuška, I.;Comput. Methods Appl. Mech. Engrg.,1977
4. A bound on the 𝐿_{∞}-norm of 𝐿₂-approximation by splines in terms of a global mesh ratio;de Boor, Carl;Math. Comp.,1976
5. Rate of convergence estimates for nonselfadjoint eigenvalue approximations;Bramble, J. H.;Math. Comp.,1973