1.
Correspondence with Paul Steinhardt, Princton University,
April 4, 2000,
steinh@feynman.princeton.edu.
2.
Correspondence
with John Schwarz, Caltech, March 21, 2000, jhs@theory.caltech.edu
3.
Arkani-Hamed,
Dimopoulos,Dvali; The Hierarchy Problem and New Dimensions at a Millimeter;
July 15, 1999 ; SLAC-PUB-7769.
4.
Siegfreid;
Stretching your Brane; The Dallas Morning News; March 20, 2000, http://www.dallasnews.com/science/0705sciIbranes.htm.
5.
“Webelements”;
http://www.webelements.com/
6.
“Treasure
Troves – Physics”; http://www.treature-troves.com
7.
Special
thanks to Donald Marolf for problem discussion.; marolf@suhep.phy.syr.edu