1. Russell D. Blyth and Robert Fitzgerald Morse, Computing the nonabelian tensor squares of polycyclic groups, J. Algebra 321 (2009), no. 8, 2139–2148.[MR]
  2. Luise-Charlotte Kappe and Robert Fitzgerald Morse, On commutators in groups, Groups St. Andrews 2005. Vol. 2, London Math. Soc. Lecture Note Ser., vol. 340, Cambridge Univ. Press, Cambridge, 2007, pp. 531–558.[MR]