References

 [CS97]

Cai X. C. et Sarkis M. - A restricted additive Schwarz preconditioner for general sparse linear systems, Tech Report CU-CS-843-97, Dept. of Comp. Sci., Univ. of Colorado at Boulder, 1997. (SIAM J. Numer. Anal., submitted)

 [Hac85]

Hackbusch W. - multi-grid methods and applications. - Springer Verlag, 1985, Springer series in Computationl Mathematics, volume 4.

 [Wes91]

Wesseling P. - An introduction to multigrid methods. - John Wiley and sons, 1991.