1. Gravvanis, G.A.: Generalized approximate inverse preconditioning for solving nonlinear elliptic boundary-value problems. J. Applied Math. 2(11), 1363–1378 (2000)
2. Gravvanis, G.A.: Parallel matrix techniques. In: Papailiou, K., Tsahalis, D., Periaux, J., Hirsch, C., Pandolfi, M. (eds.) Computational Fluid Dynamics, vol. I, pp. 472–477. Wiley, Chichester (1998)
3. Gravvanis, G.A., Bekakos, M.P., Efremides, O.B.: Parallel implicit preconditioned conjugate gradient methods for solving biharmonic equations. In: Sixth Hellenic- European Conf. on Computer Math. and its Applications (2004) (to appear)
4. Gravvanis, G.A., Giannoutakis, K.M.: Normalized explicit approximate inverse preconditioning for solving 3D boundary value problems on uniprocessor and distributed systems (submitted for publication)
5. Gravvanis, G.A., Giannoutakis, K.M.: On the rate of convergence and complexity of normalized implicit preconditioning for solving finite difference equations in three space variables. I. J. of Comput. Meth. (to appear)