TY  - JOUR
AU  - Yasuo Matsushita
TI  - Fields of 2-planes and two kinds of almost complex structures on compact 4-dimensional manifolds.
JO  - Mathematische Zeitschrift
PY  - 1991
SP  - 281
EP  - 292
VL  - 207
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1991__207_2_174269/
ID  - MZ_1991__207_2_174269
ER  -