TY  - JOUR
AU  - V. T. Videv
TI  - Two Curvature Operators in Riemannian and Lorentzian Geometry
JO  - Mathematica balkanica
PY  - 2001
SP  - 7
VL  - 15
IS  - 1-2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MABA_2001_15_1-2_a1/
ID  - MABA_2001_15_1-2_a1
ER  -