TY  - JOUR
AU  - Christer O. Kiselman
TI  - Smoothness of vector sums of plane convex sets.
JO  - Mathematica Scandinavica
PY  - 1987
SP  - 239
EP  - 252
VL  - 60
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS2_1987__60_167020/
ID  - MS2_1987__60_167020
ER  -