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"Subalgebras of Incidence Algebras Determined by Equivalence Relations."
K. J. Harrison, W. E. Longstaff (1981)
- K. J. Harrison, W. E. Longstaff:
Subalgebras of Incidence Algebras Determined by Equivalence Relations. J. Comb. Theory A 31(1): 94-97 (1981)
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