1. Bank, R.E., Yeserentant, H. (1989): Some Remarks on the Hierarchical Basis Multigrid Method. In: T. Chan, R. Glowinski, J. Périaux, O. Widlund, eds., Domain Decomposition Methods. SIAM
2. Bramble, J.H., Pasciak, J.E., Schatz, A.H. (1986): The Construction of Preconditioners for Elliptic Problems by Substructuring. Math. Comput.47, 103?134
3. Bramble, J.H., Pasciak, J.E., Xu, J.C. (1988): The Analysis of Multigrid Algorithms for Nonsymmetric and Indefinite Elliptic Problems. Math. Comput.51, 389?414
4. Cai, X.-C. (1989): Some Domain Decomposition Algorithms for Nonselfadjoint Elliptic and Parabolic Partial Differential Equations. Ph.D. thesis, Courant Institute, New York University
5. Cai, X.-C. (1990): An Additive Schwarz Algorithm for Nonselfadjoint Elliptic Equations. In: T. Chan, R. Glowinski, J. Périaux, O. Widlund, eds., Third International Symposium on Domain Decomposition Methods for Partial Differential Equations. SIAM, Philadelphia, PA