Geoffrey Mason and Michael P. Tuite(2009)Free Bosonic Vertex Operator Algebras on Genus Two Riemann Surfaces I, Commun. Math. Phys. 300, 673-713 (2010)
Michael P. Tuite and Alexander Zuevsky(2010)Genus Two Partition and Correlation Functions for Fermionic Vertex Operator Superalgebras I, Commun.Math.Phys.306:419-447,2011
Geoffrey Mason and Michael P. Tuite(2007)The Genus Two Partition Function for Free Bosonic and Lattice Vertex Operator Algebras, Geoffrey Mason and Michael P. Tuite