@article{IM_1990__100_2_143787,
     author = {A. Granville},
     title = {On the size of the first factor of the class number of a cyclotomic field.},
     journal = {Inventiones mathematicae},
     pages = {321--338},
     publisher = {mathdoc},
     volume = {100},
     number = {2},
     year = {1990},
     zbl = {0701.11051},
     url = {http://geodesic.mathdoc.fr/item/IM_1990__100_2_143787/}
}