[OT] Original citation for TDX

Gents and Ladies, 

I'm looking for the original description of TDX. 
TDX, for those who don't know, is a 
gravitationally polarized explosive that, instead 
of blowing up in a big spherical blast wave, 
produces a shock wave along a thin plane 
perpendicular to the ground. This is useful in sci-
fi for creating abatis, for clearing an emergency 
LZ for a VTOL in the forest, etc. etc. Works 
pretty good for cutting enemy squads in half 
too.

What I'm wondering is.... who invented it? It was 
some sci-fi author (I think maybe Alan Dean 
Foster but I'm not sure) and what book was it 
first described in? I first heard about it in an 
article for Traveller (the first game, not the 
subsequent N incarnations) in White Dwarf a 
while before WD became a GW house organ. 
But that wasn't its source. 

Anyone who can help me, drop me an e-mail 
off-list with any citation. I'd be interested to 
locate the original work. 

Thomas B. 
-----------------------------------------------------------
Thomas Barclay
Instructor, CST 6304 (TCP/IP programming for the Internet)
kaladorn@fox.nstn.ca 
http://fox.nstn.ca/~kaladorn/CST6304
http://stargrunt.ca/tb/CST6304