@article{PORMA_1985__43_1_114537,
     author = {Deutsch, Emeric and Neumann, Michael},
     title = {On the derivatives of the {Perron} vector},
     journal = {Portugaliae mathematica},
     pages = {35--42},
     publisher = {mathdoc},
     volume = {43},
     number = {1},
     year = {1985},
     mrnumber = {0875050},
     zbl = {0594.15008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1985__43_1_114537/}
}