TY  - JOUR
AU  - Letizia Brunetti
TI  - An Osserman-type condition on $g.f.f$-manifolds with Lorentz metric
JO  - Annales Polonici Mathematici
PY  - 2014
SP  - 123
EP  - 141
VL  - 110
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/ap110-2-3/
DO  - 10.4064/ap110-2-3
LA  - en
ID  - 10_4064_ap110_2_3
ER  -