no. 2
Coverings of fibrations
Compositio Mathematica, Tome 26 (1973) no. 2, pp. 119-128. 
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     volume = {26},
     number = {2},
     year = {1973},
     mrnumber = {322867},
     zbl = {0254.55016},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1973__26_2_119_0/}
}
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Becker, James C.; Gottlieb, Daniel Henry. Coverings of fibrations. Compositio Mathematica, Tome 26 (1973) no. 2, pp. 119-128. http://archive.numdam.org/item/CM_1973__26_2_119_0/

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