TY  - JOUR
AU  - V. I. Berdyshev
TI  - Object visibility for an observer with inaccurately given coordinates
JO  - Trudy Instituta matematiki i mehaniki
PY  - 2009
SP  - 21
EP  - 28
VL  - 15
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/TIMM_2009_15_3_a1/
LA  - ru
ID  - TIMM_2009_15_3_a1
ER  -