Hertweck, Martin and Eric Jespers. "Class-preserving automorphisms and the normalizer property for Blackburn groups" Journal of Group Theory, 12.1 (2008): 157-169. Retrieved 19 May. 2013, from doi:10.1515/JGT.2008.068

Hertweck, M. & Jespers, E. (2008). Class-preserving automorphisms and the normalizer property for Blackburn groups. Journal of Group Theory, 12(1), pp. 1-169. Retrieved 19 May. 2013, from doi:10.1515/JGT.2008.068

Hertweck, Martin and Eric Jespers. 2008. Class-preserving automorphisms and the normalizer property for Blackburn groups. Journal of Group Theory. 12(1): 1-169. Retrieved 19 May. 2013, from doi:10.1515/JGT.2008.068