added pointer to today’s

- Yi-Zhi Huang,
*Representation theory of vertex operator algebras and orbifold conformal field theory*(arXiv:2004.01172)

I added two references at vertex operator algebra, in the bibliography section on deformations.

]]>added to the References at *vertex operator algebra* a pointer to their formalization as *factorization algebras of observables*.

I have expanded vertex operator algebra (more references, more items in the Properties-section) in partial support to a TP.SE answer that I posted here

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