Robuta

https://www.arxiv.org/abs/1412.5535
Abstract page for arXiv paper 1412.5535: Elliptic multiple zeta values and one-loop superstring amplitudes
multiple zeta valuesand oneellipticloopsuperstring
https://www.arxiv.org/abs/1703.10563
Abstract page for arXiv paper 1703.10563: Hyperbolic Geometry of Superstring Perturbation Theory
hyperbolic geometryperturbation theorysuperstring
https://www.arxiv.org/abs/hep-th/0303017
Abstract page for arXiv paper hep-th/0303017: A Representation of Symmetry Generators for the Type IIB Superstring on a Plane Wave in the U(4) Formalism
hepthrepresentationsymmetrygenerators