@article{CM_1973__26_2_119_0,
     author = {Becker, James C. and Gottlieb, Daniel Henry},
     title = {Coverings of fibrations},
     journal = {Compositio Mathematica},
     pages = {119--128},
     publisher = {Noordhoff International Publishing},
     volume = {26},
     number = {2},
     year = {1973},
     mrnumber = {322867},
     zbl = {0254.55016},
     language = {en},
     url = {http://www.numdam.org/item/CM_1973__26_2_119_0/}
}