@article{10_4171_ggd_159,
     author = {Fran\c{c}ois Ledrappier},
     title = {Analyticity of the entropy for some random walks},
     journal = {Groups, geometry, and dynamics},
     pages = {317--333},
     year = {2012},
     volume = {6},
     number = {2},
     doi = {10.4171/ggd/159},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/159/}
}