@article{10_4153_CJM_1971_027_9,
     author = {Marshall, Murray A.},
     title = {Ramification {Groups} of {Abelian} {Local} {Field} {Extensions}},
     journal = {Canadian journal of mathematics},
     pages = {271--281},
     year = {1971},
     volume = {23},
     number = {2},
     doi = {10.4153/CJM-1971-027-9},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1971-027-9/}
}