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*{{Citation | last1=Pöschel | first1=R | year=1989 | title=The equational logic for graph algebras | journal=Z. Math. Logik Grundlag. Math. | volume=35 | issue=3 | pages=273-282 | id={{MathSciNet | id=1000970}} }}
[[Category:Universal algebra]]
[[Category:Graph theory]]
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