1. I. Algor and N. Alon,The star-arboricity of graphs, Discrete Math.75 (1989), 11–22.
2. N. Alon and D. J. Kleitman,Sum-free subsets, inA Tribute to Paul Erdös (A. Baker, B. Bollobás and A. Hajnal, eds.), Cambridge Univ. Press, 1990, pp. 13–26.
3. N. J. Calkin,On the number of sum-free sets, to appear.
4. P. J. Cameron,Portrait of a typical sum-free set, inSurveys in Combinatorics 1987 (C. Whitehead, ed.), London Math. Soc. Lecture Notes123, Cambridge Univ. Press, 1987, pp. 13–42.
5. P. J. Cameron and P. Erdös,On the number of sets of integers with various properties, inProceedings of the 1988 Canadian Number Theory Conference at Banff (R. Mollin, ed.), to appear.