Combinatorial systems defined over one- and two-letter alphabets.
Archiv für mathematische Logik und Grundlagenforschung, Tome 17 (1975), pp. 25-34.

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@article{AMLG_1975__17_137899,
     author = {Ch.E. Hughes and W.E. Singletary},
     title = {Combinatorial systems defined over one- and two-letter alphabets.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {25--34},
     publisher = {mathdoc},
     volume = {17},
     year = {1975},
     zbl = {0336.02035},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1975__17_137899/}
}
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Ch.E. Hughes; W.E. Singletary. Combinatorial systems defined over one- and two-letter alphabets.. Archiv für mathematische Logik und Grundlagenforschung, Tome 17 (1975), pp. 25-34. http://geodesic.mathdoc.fr/item/AMLG_1975__17_137899/