@article{01285144,
title = {A homotopy 2-groupoid from a fibration.},
journal = {Homology, Homotopy and Applications},
volume = {1},
year = {1999},
pages = {79-93},
zbl = {0914.55006},
language = {en},
url = {http://dml.mathdoc.fr/item/01285144}
}
Kamps, K.H.; Porter, T. A homotopy 2-groupoid from a fibration.. Homology, Homotopy and Applications, Tome 1 (1999) pp. 79-93. http://gdmltest.u-ga.fr/item/01285144/