no. 3
Homotopy classification of regular sections
Compositio Mathematica, Tome 32 (1976) no. 3, pp. 301-333. 
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     author = {du Plessis, Andrew},
     title = {Homotopy classification of regular sections},
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     pages = {301--333},
     publisher = {Noordhoff International Publishing},
     volume = {32},
     number = {3},
     year = {1976},
     mrnumber = {413163},
     zbl = {0333.58004},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1976__32_3_301_0/}
}
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du Plessis, Andrew. Homotopy classification of regular sections. Compositio Mathematica, Tome 32 (1976) no. 3, pp. 301-333. http://archive.numdam.org/item/CM_1976__32_3_301_0/

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