TY  - JOUR
AU  - Yongqiao Wang
AU  - Donghe Pei
TI  - Singularities for normal hypersurfaces of de Sitter timelike curves in Minkowski 4-space
JO  - Journal of Singularities
PY  - 2015
SP  - 207
EP  - 214
VL  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.5427/jsing.2015.12o/
DO  - 10.5427/jsing.2015.12o
ID  - 10_5427_jsing_2015_12o
ER  -