Ronald Brown. Homotopy theory, and change of base for groupoids and multiple groupoids. Applied Categorical Structures, 4(2-3):175-193, 1996. [doi]
@article{Brown96-3,
title = {Homotopy theory, and change of base for groupoids and multiple groupoids},
author = {Ronald Brown},
year = {1996},
doi = {10.1007/BF00122251},
url = {http://dx.doi.org/10.1007/BF00122251},
researchr = {https://researchr.org/publication/Brown96-3},
cites = {0},
citedby = {0},
journal = {Applied Categorical Structures},
volume = {4},
number = {2-3},
pages = {175-193},
}