1993 | ||
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3 | EE | James E. Simpson: A bipartite Erdös-Ko-Rado theorem. Discrete Mathematics 113(1-3): 277-280 (1993) |
1987 | ||
2 | EE | James E. Simpson: A note on perfect systems of difference sets. Discrete Mathematics 63(1): 109-110 (1987) |
1983 | ||
1 | EE | James E. Simpson: Langford sequences: perfect and hooked. Discrete Mathematics 44(1): 97-104 (1983) |