@article{CRMATH_2007__344_5_309_0,
     author = {Piedra, Ramon and Tornero, Jos\'e M.},
     title = {Hironaka's characteristic polygon and effective resolution of surfaces},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {309--312},
     publisher = {Elsevier},
     volume = {344},
     number = {5},
     year = {2007},
     doi = {10.1016/j.crma.2007.01.021},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2007.01.021/}
}