| |
| 1980 | ||
|---|---|---|
| 2 | William T. Spears, Barbara Jeffcott, D. M. Jackson: An Algebraic Theory of Sequence Enumeration. J. Comb. Theory, Ser. A 28(2): 191-218 (1980) | |
| 1972 | ||
| 1 | Barbara Jeffcott: The Center of an Orthologic. J. Symb. Log. 37(4): 641-645 (1972) | |
| 1 | D. M. Jackson | [2] |
| 2 | William T. Spears | [2] |