@article{EXMA_2005__14_3_52134,
     author = {Sumida-Takahashi, Hiroki},
     title = {The {Iwasawa} invariants and the higher -groups associated to real quadratic fields.},
     journal = {Experimental mathematics},
     pages = {307--316},
     publisher = {mathdoc},
     volume = {14},
     number = {3},
     year = {2005},
     zbl = {1082.11071},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMA_2005__14_3_52134/}
}