@article{RM_2002_57_3_a1,
     author = {S. K. Lando},
     title = {Ramified coverings of the two-dimensional sphere and the intersection theory in spaces 
},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {463--533},
     publisher = {mathdoc},
     volume = {57},
     number = {3},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2002_57_3_a1/}
}