Williams, N. H. Families of sets having property B. (English) Zbl 0468.04006 Period. Math. Hung. 12, 181-190 (1981). MSC: 03E05 × Cite Format Result Cite Review PDF Full Text: DOI
Gillam, D. W. H.; Hall, T. E.; Williams, N. H. An addition theory for finite semigroups. (English) Zbl 0324.20074 Semigroup Forum 10, 273-276 (1975). MSC: 20M35 × Cite Format Result Cite Review PDF Full Text: DOI EuDML