@article{01305713, title = {Higher homotopy groupoids and Toda brackets.}, journal = {Homology, Homotopy and Applications}, volume = {1}, year = {1999}, pages = {117-134}, zbl = {1002.55011}, language = {en}, url = {http://dml.mathdoc.fr/item/01305713} }
Hardie, K.A.; Kamps, K.H.; Kieboom, R.W. Higher homotopy groupoids and Toda brackets.. Homology, Homotopy and Applications, Tome 1 (1999) pp. 117-134. http://gdmltest.u-ga.fr/item/01305713/