@article{10_4064_aa150_3_4,
     author = {Humio Ichimura},
     title = {Class group of a cyclotomic
 $\mathbb Z_p\times\mathbb Z_{\ell}$-extension},
     journal = {Acta Arithmetica},
     pages = {263--283},
     publisher = {mathdoc},
     volume = {150},
     number = {3},
     year = {2011},
     doi = {10.4064/aa150-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa150-3-4/}
}