@article{BUMI_2003_8_6B_2_a12,
     author = {Yousefi, B. and Jahedi, S.},
     title = {Composition operators on {Banach} spaces of formal power series},
     journal = {Bollettino della Unione matematica italiana},
     pages = {481--487},
     publisher = {mathdoc},
     volume = {Ser. 8, 6B},
     number = {2},
     year = {2003},
     zbl = {1150.47014},
     mrnumber = {357743},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2003_8_6B_2_a12/}
}