@article{CM_1952__10__286_0,
     author = {Yano, Kentaro and Hiramatu, Hitosi},
     title = {On the projective geometry of $K$-spreads},
     journal = {Compositio Mathematica},
     pages = {286--296},
     publisher = {Kraus Reprint},
     volume = {10},
     year = {1952},
     mrnumber = {53589},
     zbl = {0048.16101},
     language = {en},
     url = {http://www.numdam.org/item/CM_1952__10__286_0/}
}