@article{10_4153_CMB_2014_031_6,
     author = {Cavalieri, Renzo and Marcus, Steffen},
     title = {Geometric {Perspective} on {Piecewise} {Polynomiality} of {Double} {Hurwitz} {Numbers}},
     journal = {Canadian mathematical bulletin},
     pages = {749--764},
     year = {2014},
     volume = {57},
     number = {4},
     doi = {10.4153/CMB-2014-031-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2014-031-6/}
}