Horst G. Zimmer 
Group Theory, Algebra, and Number Theory [PDF ebook] 
Colloquium in Memory of Hans Zassenhaus held in Saarbrücken, Germany, June 4-5, 1993

I-IV — Preface — Table of Contents — Contributors — Introductory address — After-dinner speech — On the solvability of the kernel of any orthogonal decomposition — The beginnings of modular Lie algebra theory — Computing invariants of algebraic number fields — Kristallographische Gruppen — Endliche Fastkörper und Zassenhausgruppen — On the arithmetic of commutative group rings