Yang, Di Max Planck Institute for Mathematics, Max Planck Society;
Zagier, Don Max Planck Institute for Mathematics, Max Planck Society;
http://www.mathjournals.org/mmj/2017-017-004/2017-017-004-003.pdf (Publisher version)
Dubrovin-Yang-Zagier_Classical Hurwitz numbers and related combinatorics_Preprint_2017.pdf (Preprint), 424KB
Dubrovin, B., Yang, D., & Zagier, D. (2017). Classical Hurwitz numbers and related combinatorics. Moscow Mathematical Journal, 17(4), 601-633.