Coverings and crossed modules of topological groups with operations
  It is a well known result in the covering groups that a subgroup $G$ of the fundamental group at the identity of a semi-locally simply connected topological group determines a covering morphism of topological groups with characteristic group $G$. In this paper we generalize this result to a large class of algebraic objects called topological groups with operations, including topological groups. We also give the cover of crossed modules within topological groups with operations. 
Osman Mucuk and Tun\c{c}ar \c{S}ahan
math.AT