TY  - JOUR
AU  - K. A. Shramov
TI  - On the rationality of non-singular threefolds with a pencil of Del~Pezzo surfaces of degree~4
JO  - Sbornik. Mathematics
PY  - 2006
SP  - 127
EP  - 137
VL  - 197
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_2006_197_1_a6/
LA  - en
ID  - SM_2006_197_1_a6
ER  -