Group-groupoids and monodromy groupoids
  This paper gives an introduction to some results on monodromy groupoids and the monodromy principle, and then develops the notion of monodromy groupoid for group groupoids. 
Osman Mucuk, Berrin K{\i}l{\i}\c{c}arslan, Tun\c{c}ar \c{S}ahan and   Nazmiye Alemdar
math.AT