1. Remarks concerning the 2-Hilbert class field of imaginary quadratic number fields;Benjamin;Bull. Austral. Math. Soc.,1993
2. E. Benjamin, 1996, Lower bounds on the 2-class number of the Hilbert 2-class field of quadratic number fields with 2-class number greater than or equal to 16
3. E. Benjamin, C. Snyder, 1993, Number fields with 2-class group isomorphic to (2,2m)
4. E. Benjamin, F. Lemmermeyer, C. Snyder, Real quadratic fields with Abelian 2-class field tower
5. On prime-power groups in which the derived group has two generators;Blackburn;Proc. Cambridge Philos. Soc.,1957