@article{ASNSP_2007_5_6_3_457_0,
     author = {Ferretti, Andrea and Zannier, Umberto},
     title = {Equations in the {Hadamard} ring of rational functions},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {457--475},
     publisher = {Scuola Normale Superiore, Pisa},
     volume = {Ser. 5, 6},
     number = {3},
     year = {2007},
     mrnumber = {2370269},
     zbl = {1150.11008},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_2007_5_6_3_457_0/}
}