@article{HHA_1999_1_1_a2,
     author = {K. H. Kamps and T. Porter},
     title = {A homotopy $2$-groupoid from a fibration},
     journal = {Homology, homotopy, and applications},
     pages = {79--93},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {1999},
     doi = {10.4310/HHA.1999.v1.n1.a2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4310/HHA.1999.v1.n1.a2/}
}