TY  - JOUR
AU  - Graham S. Hall
AU  - David P. Lonie
TI  - Holonomy and Projective Equivalence in 4-Dimensional Lorentz Manifolds
JO  - Symmetry, integrability and geometry: methods and applications
PY  - 2009
VL  - 5
UR  - http://geodesic.mathdoc.fr/item/SIGMA_2009_5_a65/
LA  - en
ID  - SIGMA_2009_5_a65
ER  -