References:<BR>
<BR>
P. Madau, A. Meiksin, & M.J. Rees, 21 cm tomography of the IGM at high<BR>
    redshift, ApJ, 475, 429, 1997<BR>
<BR>
N. Katz, L. Hernquist, & D.H. Weinberg, Simulating gas at high redshift, <BR>
    astro-ph/9801074 (9 Jan 1998)<BR>
<BR>
<A HREF="../ursi/ska.summary.html"> Square Kilometer Array</A>
web sites