TY  - JOUR
AU  - B. Wegner
TI  - A Differential Geometric Proof of the Local Geometric Characterization of Spheres and Cylinders by Boas
JO  - Mathematica balkanica
PY  - 1988
SP  - 294
VL  - 2
IS  - 3-4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MABA_1988_2_3-4_a2/
ID  - MABA_1988_2_3-4_a2
ER  -