TY  - JOUR
AU  - I. L. Sofronov
TI  - Conditions for complete transparency on a sphere for a
JO  - Doklady Akademii Nauk
PY  - 1992
SP  - 953
EP  - 957
VL  - 326
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1992_326_6_a4/
LA  - ru
ID  - DAN_1992_326_6_a4
ER  -