1. F. E. Benth and J. Gjerde: Convergence rates for finite element approximations of stochastic partial differential equations. Preprint, University of Oslo. (1996).
2. Studies in mathematics and its applications;PG Ciarlet,1978
3. Stochastics;A Germani,1988
4. T. Hida, H. -H. Kuo, J. Potthoff and L. Streit: White Noise — An Infinite Dimensional Calculus. Monograph, Kluwer Academic Publishers. (1993).
5. W. Hackbusch: Elliptic Differential Equations, Springer Verlag. (1992).