TY  - JOUR
AU  - F. Bigolin
AU  - A. Kozhevnikov
TI  - Tangency, Paratangency and Four-Cones Coincidence Theorem in Carnot Groups
JO  - Journal of convex analysis
PY  - 2014
SP  - 887
EP  - 899
VL  - 21
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/JCA_2014_21_3_JCA_2014_21_3_a16/
ID  - JCA_2014_21_3_JCA_2014_21_3_a16
ER  -