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Publication:3853836
zbMath0421.20038MaRDI QIDQ3853836
Publication date: 1979
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Categories of spans/cospans, relations, or partial maps (18B10) Ternary systems (heaps, semiheaps, heapoids, etc.) (20N10)
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