Mathematical Sciences Classification System
13Fxx - Arithmetic rings and other special rings
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                            13F05Dedekind, Prüfer, Krull and Mori rings and their generalizations
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                            13F07Euclidean rings and generalizations
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                            13F10Principal ideal rings
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                            13F15
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                            13F20
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                            13F25Formal power series rings [See also 13J05]
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                            13F30Valuation rings [See also 13A18]
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                            13F35Witt vectors and related rings
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                            13F40Excellent rings
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                            13F45Seminormal rings
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                            13F50Rings with straightening laws, Hodge algebras
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                            13F55Stanley-Reisner face rings; simplicial complexes [See also 55U10]
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                            13F60Cluster algebras
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                            13F99None of the above, but in this section