@article{GDZPPN002237296,
title = {Equivalence classes of Fields of 2-planes and two kinds of almost complex structures on compact four-dimensional manifolds.},
journal = {Manuscripta mathematica},
volume = {86},
year = {1995},
pages = {409-416},
zbl = {0863.57018},
url = {http://dml.mathdoc.fr/item/GDZPPN002237296}
}
Matsushita, Yasuo. Equivalence classes of Fields of 2-planes and two kinds of almost complex structures on compact four-dimensional manifolds.. Manuscripta mathematica, Tome 86 (1995) pp. 409-416. http://gdmltest.u-ga.fr/item/GDZPPN002237296/