TY  - JOUR
AU  - Georgi Dzhelepov
TI  - Spheres and circles in the tangent space at a point on a Riemannian manifold with respect to an indefinite metric
JO  - Novi Sad Journal of Mathematics
PY  - 2018
SP  - 143 
EP  -  150
VL  - 48
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.30755/NSJOM.07233/
DO  - 10.30755/NSJOM.07233
ID  - 10.30755/NSJOM.07233
ER  -