1. Mathematical Foundations of the Finite Element Method with Applications to Partial Differential Equations,1972
2. I. Babuška and J.E. Osborn, Private communication.
3. Integral Operators in the Theory of Linear Partial Differential Equations;Bergman,1961
4. A transpose-free quasi-minimal residual algorithm for non-hermitian linear systems;Freund;SIAM J. Sci. Comput.,1993
5. Table of Integrals, Series and Products;Gradshtein,1980