@article{Roberts01,
   author =  {A. J. Roberts},
   title =   {Simple and fast multigrid solution of {Poisson's} equation using 
              diagonally oriented grids},
   journal = {ANZIAM~J.},
   volume =  43,
   pages =   {E1--E36},
   year =    2001,
   number =  {E},
   month =   jul,
   note =    {[Online] \protect\url{http://anziamj.austms.org.au/V43/E025} [2 
              Jul 2001]},
}