We show that the forgetful functor from the category ofbraided regular crossed modules to the category of regular (or whiskered) groupoids is a fibration and also a cofibration.
ODABAŞ, ALPER and ULUALAN, ERDAL
"Braided regular crossed modules bifibered over regular groupoids,"
Turkish Journal of Mathematics: Vol. 41:
6, Article 3.
Available at: https://journals.tubitak.gov.tr/math/vol41/iss6/3