1. Finite Geometries
2. 2 J. E. Graver and W. B. Jurkat , Algebra-Structures for General t-Designs, to appear.
3. 3 J. E. Graver and W. B. Jurkat , On the Linear Structure of t-Designs, to appear.
4. 5 W. B. Jurkat , Exact Covers of Finite Sets, to appear.