Zagier, Don Max Planck Institute for Mathematics, Max Planck Society;
https://dx.doi.org/10.4310/CNTP.2020.v14.n2.a4 (Verlagsversion)
https://doi.org/10.48550/arXiv.1906.12339 (Preprint)
Zagier, D., & Zerbini, F. (2020). Genus-zero and genus-one string amplitudes and special multiple zeta values. Communications in Number Theory and Physics, 14(2), 413-452. doi:10.4310/CNTP.2020.v14.n2.a4.