@article{10_4064_aa108_4_5,
     author = {Andrea Bandini},
     title = {Greenberg's conjecture for ${\Bbb Z}_p^d$-extensions},
     journal = {Acta Arithmetica},
     pages = {357--368},
     publisher = {mathdoc},
     volume = {108},
     number = {4},
     year = {2003},
     doi = {10.4064/aa108-4-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa108-4-5/}
}