@article{MAN_1988__280_3_164393,
     author = {Yasuo Matsushita},
     title = {Fields of {2-Planes} on {Compact} {Simply-Connected} {Smooth} {4-Manifolds.}},
     journal = {Mathematische Annalen},
     pages = {687--690},
     publisher = {mathdoc},
     volume = {280},
     number = {3},
     year = {1988},
     zbl = {0628.57016},
     url = {http://geodesic.mathdoc.fr/item/MAN_1988__280_3_164393/}
}