no. 4
Geometry and deformation of special Schubert varieties
Compositio Mathematica, Tome 23 (1971) no. 4, pp. 407-434. 
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     volume = {23},
     number = {4},
     year = {1971},
     mrnumber = {314855},
     zbl = {0238.14006},
     language = {en},
     url = {http://www.numdam.org/item/CM_1971__23_4_407_0/}
}
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Kleiman, Steven L.; Landolfi, John. Geometry and deformation of special Schubert varieties. Compositio Mathematica, Tome 23 (1971) no. 4, pp. 407-434. http://www.numdam.org/item/CM_1971__23_4_407_0/

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