@article{Dow98a,
   author =   {M.~Dow},
   title =    {Sparse inverse and characteristic polynomial of generalized arrow 
               matrix},
   journal =  {J.\ Austral.\ Math.\ Soc.\ B},
   volume =   39,
   pages =    {667--677},
   year =     1998,
   number =   {E},
   month =    mar,
   note =     {[Online] http:\-//jamsb.\-austms.\-org.\-au/\-V39/\-E008 
               [20 Mar 98]},
   abstract = {A generalized arrow matrix of order $n$ with $m$ non-zero rows 
               and columns is presented. If a simple condition holds, the 
               inverse of this matrix is also an arrow matrix of the same form. 
               We then derive a simple expression for its characteristic 
               polynomial.},
}