@article{10_4064_aa137_3_8,
     author = {Joseph H. Silverman and Jos\'e  Felipe Voloch},
     title = {A local-global criterion for dynamics on $\mathbb P^1$},
     journal = {Acta Arithmetica},
     pages = {285--294},
     publisher = {mathdoc},
     volume = {137},
     number = {3},
     year = {2009},
     doi = {10.4064/aa137-3-8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa137-3-8/}
}