@article{MM2_1995__88_1_156135,
     author = {Yasuo Matsushita},
     title = {Equivalence classes of {Fields} of 2-planes and two kinds of almost complex structures on compact four-dimensional manifolds.},
     journal = {Manuscripta mathematica},
     pages = {409--416},
     publisher = {mathdoc},
     volume = {88},
     number = {1},
     year = {1995},
     zbl = {0863.57018},
     url = {http://geodesic.mathdoc.fr/item/MM2_1995__88_1_156135/}
}