@article{CM_1956-1958__13__47_0,
     author = {Neumann, B. H.},
     title = {Ascending derived series},
     journal = {Compositio Mathematica},
     pages = {47--64},
     publisher = {Kraus Reprint},
     volume = {13},
     year = {1956-1958},
     mrnumber = {89196},
     zbl = {0070.25405},
     language = {en},
     url = {http://www.numdam.org/item/CM_1956-1958__13__47_0/}
}