TY  - JOUR
AU  - A. V. Isaev
TI  - Classification of spherical tube hypersurfaces having two minuses in the Levy signature form
JO  - Matematičeskie zametki
PY  - 1989
SP  - 28
EP  - 36
VL  - 46
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1989_46_1_a3/
LA  - ru
ID  - MZM_1989_46_1_a3
ER  -