1. Baayen, P. C.: (C2⊕C2⊕C2⊕C2n) is true for odd n. Report ZW-1969-006. Math. Centre Amsterdam
2. Davenport, H.: Proceedings of the Midwestern Conference on Group theory and Number theory. Ohio State University, April 1966
3. Emde Boas, P. van.: A combinatorial problem on finite abelian groups II. Report ZW-1969-007. Math. Centre Amsterdam
4. Emde Boas, P. van, Kruyswijk, D.: A combinatorial problem on finite abelian groups III. Report ZW-1969-008. Math. Center Amsterdam
5. Geroldinger, A., Schneider, R.: On Davenport's constant (to appear)