On the projective geometry of K-spreads
Compositio Mathematica, Tome 10 (1952), pp. 286-296. 
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     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/}
}
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Yano, Kentaro; Hiramatu, Hitosi. On the projective geometry of $K$-spreads. Compositio Mathematica, Tome 10 (1952), pp. 286-296. http://www.numdam.org/item/CM_1952__10__286_0/

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