1. BRANDT, A.; DINAR, N., Multi-grid solutions to elliptic flow problems, Report Number 79-15, July 16, ICASE (1979).
2. Mathematics report;P.O. Frederickson,1975
3. HACKBUSCH, W., On the multigrid method applied to difference equations, Computing 20 (1978), 291–306.
4. HEMKER, P.W., Fourier Analysis of gridfunctions, prolongations and restrictions, Report NW 93/80, Mathematical Centre, Amsterdam (1980).
5. MOL, W.J.A., On the choice of suitable operators and parameters in multigrid methods, Report NW 107/81, Mathematical Centre, Amsterdam (1981).