@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/