Mullin, R. C.; Schellenberg, P. J.; Vanstone, S. A.; Wallis, W. D. On the existence of frames. (English) Zbl 0465.05015 Discrete Math. 37, 75-104 (1981). MSC: 05B15 05B30 × Cite Format Result Cite Review PDF Full Text: DOI
Mullin, R. C. A generalization of the singular direct product with applications to skew room squares. (English) Zbl 0461.05013 J. Comb. Theory, Ser. A 29, 306-318 (1980). MSC: 05B15 × Cite Format Result Cite Review PDF Full Text: DOI