Degenerate cohomological Hall algebra and quantized Donaldson-Thomas invariants for $m$-loop quivers.
Documenta mathematica, Tome 17 (2012), pp. 1-22.

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Summary: We derive a combinatorial formula for quantized Donaldson-Thomas invariants of the $m$-loop quiver. Our main tools are the combinatorics of noncommutative Hilbert schemes and a degenerate version of the Cohomological Hall algebra of this quiver.
Classification : 16G20, 05E05, 14N35
Keywords: quantized Donaldson-Thomas invariant, cohomological Hall algebra, noncommutative Hilbert scheme
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     author = {Reineke, Markus},
     title = {Degenerate cohomological {Hall} algebra and quantized {Donaldson-Thomas} invariants for $m$-loop quivers.},
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Reineke, Markus. Degenerate cohomological Hall algebra and quantized Donaldson-Thomas invariants for $m$-loop quivers.. Documenta mathematica, Tome 17 (2012), pp. 1-22. http://geodesic.mathdoc.fr/item/DOCMA_2012__17__a29/