TY  - BOOK
A1  - Schmidt, Hans-Jürgen
T1  - Why do all the curvature invariants of a gravitational wave vanish?
T2  - Preprint / Universität Potsdam, Institut für Mathematik
Y1  - 1994
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/28579
VL  - 1994, 03
PB  - Univ.
CY  - Potsdam
ER  -