Geodesic
Combinatorial examples in the theory of $AF$-algebras
Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part 10, Tome 172 (1989), pp. 55-67

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Examples of ramification graphs of combinatorial origin are presented. These graphs determine the Grothendieck group and the traces of the corresponding $AF$-algebras. 
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     author = {S. V. Kerov},
     title = {Combinatorial examples in the theory of $AF$-algebras},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {55--67},
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     volume = {172},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1989_172_a3/}
}
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S. V. Kerov. Combinatorial examples in the theory of $AF$-algebras. Zapiski Nauchnykh Seminarov POMI, Differential geometry, Lie groups and mechanics. Part 10, Tome 172 (1989), pp. 55-67. http://geodesic.mathdoc.fr/item/ZNSL_1989_172_a3/