scientific article; zbMATH DE number 3329991
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Publication:5608078
zbMath0207.33201MaRDI QIDQ5608078
Publication date: 1961
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Commutative semigroups (20M14) Topological groupoids (including differentiable and Lie groupoids) (22A22)
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