TY  - JOUR
AU  - V.C. Dumir
AU  - R.J. Hans-Gills
TI  - A Markoff-Type Chain for the View-Obstruction Problem for Spheres in R4.
JO  - Monatshefte für Mathematik
PY  - 1994
SP  - 205
EP  - 218
VL  - 118
IS  - 3-4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MOMA_1994__118_3-4_178664/
ID  - MOMA_1994__118_3-4_178664
ER  -