@article{CM_1976__32_2_185_0,
     author = {Hartley, B.},
     title = {Subgroups of locally normal groups},
     journal = {Compositio Mathematica},
     pages = {185--201},
     publisher = {Noordhoff International Publishing},
     volume = {32},
     number = {2},
     year = {1976},
     mrnumber = {414713},
     zbl = {0335.20017},
     language = {en},
     url = {http://www.numdam.org/item/CM_1976__32_2_185_0/}
}