H. Balasin, D. Grumiller:
"The ultrarelativistic limit of 2D dilaton gravity and its energy-momentum tensor";
Classical and Quantum Gravity, 21 (2004), 2859 - 2872.
http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04970041
Project Head Daniel Grumiller:
Nichtperturbative Aspekte von 2d Dilatongravitation