References
- Corner, A. L. S. (1963). On a conjecture of Pierce concerning direct decompositions of Abelian groups. In: 1964 Proc. Colloq. Abelian Groups, Tihany. Budapest: Akadmiai Kiad, pp. 43–48.
- Engel, A. (1998). Problem-Solving Strategies. New York: Springer-Verlag.
- Kaplansky, I. (1972). Set Theory and Metric Spaces. Boston, MA: Allyn and Bacon, Inc.