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Journal of Number Theory, Vol. 6, No. 3, June 1974 by Hans Zassenhaus,  1974
Journal of Number Theory , Vol. 3 1971 by Hans Zassenhaus,  1971
Theory of Groups. by Hans Zassenhaus,  1949
Journal of Number Theory, Vol. 6, No. 2, Apr. 1972 by Hans Zassenhaus,  1972
Journal of Number Theory, Vol. 6, No. 1, Feb. 1974 by Hans Zassenhaus,  1974
Journal of Number Theory , Vol. 4 1972 by Hans Zassenhaus,  1972
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