@article{10_4153_CJM_2017_032_9,
     author = {Hajir, Farshid and Maire, Christian},
     title = {On the {Invariant} {Factors} of {Class} {Groups} in {Towers} of {Number} {Fields}},
     journal = {Canadian journal of mathematics},
     pages = {142--172},
     year = {2018},
     volume = {70},
     number = {1},
     doi = {10.4153/CJM-2017-032-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-2017-032-9/}
}