2010 Evgeny Feigin, "Systems of correlation functions, coinvariants and the Verlinde algebra" arXiv

We prove that these spaces are isomorphic to the spaces of coinvariants with respect to certain subalgebras of ${\hat {\mathfrak {g}}}$.

2010 Adam Hanley Fuller, "Finitely correlated representations of product systems of C^{*}-correspondences over N^{k}" arxiv

We show that the nonself-adjoint WOT-closed algebra generated by a finitely correlated, isometric, fully coisometric representation of such a graph contains the projection onto its unique minimal cyclic coinvariant subspace.