@article{10_4064_aa169_2_1,
     author = {Yoko Inoue and Kaori Ota},
     title = {Indices of subfields of cyclotomic ${\mathbb Z}_p$-extensions and higher degree {Fermat} quotients},
     journal = {Acta Arithmetica},
     pages = {101--114},
     publisher = {mathdoc},
     volume = {169},
     number = {2},
     year = {2015},
     doi = {10.4064/aa169-2-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa169-2-1/}
}