1. J. André, In memoriam Hans Zassenhaus, Results in Mathematics 21 (1992), 223-224.
2. Bibliography of Hans Zassenhaus, J. Symbolic Comput. 4 (1) (1987) 129-135.
3. L.-C. Kappe, Remembering Hans Zassenhaus, Group Theory (World Sci. Publishing, River Edge, NJ, 1993), 1-3.
4. W. Plesken, Hans Zassenhaus 1912-1991, Jahresberichte der Deutschen Mathematiker Vereinigung 96 (1994), 1-20.
5. M. Pohst, In memoriam : Hans Zassenhaus (1912-1991), J. Number Theory 47 (1994), 1-19.
6. R. Solomon, Hans Zassenhaus 1912-1991, Group Theory (World Sci. Publishing, River Edge, NJ, 1993), 4-5.

Some additional information about Hans Zassenhaus' family and the difficulties they experienced during the Nazi period may be found in the following autobiographical account by his younger sister.

Hiltgunt Zassenhaus, Walls: Resisting the Third Reich--One Woman's Story, Beacon Press, Boston, 1974.

Department of Mathematics