Hurwitz numbers and intersections on moduli spaces of curves
arXiv:math/0004096 · doi:10.1007/s002220100164
Abstract
This article is an extended version of preprint math.AG/9902104. We find an explicit formula for the number of topologically different ramified coverings of a sphere by a genus g surface with only one complicated branching point in terms of Hodge integrals over the moduli space of genus g curves with marked points.
30 pages (AMSTeX). Minor typos are corrected