A class of unital simple Exel-Laca algebras has reciprocal duals that are simple Cuntz-Krieger algebras defined via their underlying infinite matrices, with explicit computation of the strong extension groups.
Schochet , A Pext primer: Pure extensions and ^1 for infinite abelian groups , NYJM Monographs 1 (2003)
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A class of Exel--Laca algebras reciprocal to Cuntz--Krieger algebras
A class of unital simple Exel-Laca algebras has reciprocal duals that are simple Cuntz-Krieger algebras defined via their underlying infinite matrices, with explicit computation of the strong extension groups.